feature/featuretags: add features for c2n, peerapi, advertise/use routes/exit nodes

Saves 262 KB so far. I'm sure I missed some places, but shotizam says
these were the low hanging fruit.

Updates #12614

Change-Id: Ia31c01b454f627e6d0470229aae4e19d615e45e3
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

feature/buildfeatures/feature_advertiseexitnode_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_advertiseexitnode
+
+package buildfeatures
+
+// HasAdvertiseExitNode is whether the binary was built with support for modular feature "Run an exit node".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_advertiseexitnode" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasAdvertiseExitNode = false

feature/buildfeatures/feature_advertiseexitnode_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_advertiseexitnode
+
+package buildfeatures
+
+// HasAdvertiseExitNode is whether the binary was built with support for modular feature "Run an exit node".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_advertiseexitnode" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasAdvertiseExitNode = true

feature/buildfeatures/feature_advertiseroutes_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_advertiseroutes
+
+package buildfeatures
+
+// HasAdvertiseRoutes is whether the binary was built with support for modular feature "Advertise routes for other nodes to use".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_advertiseroutes" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasAdvertiseRoutes = false

feature/buildfeatures/feature_advertiseroutes_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_advertiseroutes
+
+package buildfeatures
+
+// HasAdvertiseRoutes is whether the binary was built with support for modular feature "Advertise routes for other nodes to use".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_advertiseroutes" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasAdvertiseRoutes = true

feature/buildfeatures/feature_c2n_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_c2n
+
+package buildfeatures
+
+// HasC2N is whether the binary was built with support for modular feature "Control-to-node (C2N) support".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_c2n" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasC2N = false

feature/buildfeatures/feature_c2n_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_c2n
+
+package buildfeatures
+
+// HasC2N is whether the binary was built with support for modular feature "Control-to-node (C2N) support".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_c2n" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasC2N = true

feature/buildfeatures/feature_peerapiclient_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_peerapiclient
+
+package buildfeatures
+
+// HasPeerAPIClient is whether the binary was built with support for modular feature "PeerAPI client support".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_peerapiclient" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasPeerAPIClient = false

feature/buildfeatures/feature_peerapiclient_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_peerapiclient
+
+package buildfeatures
+
+// HasPeerAPIClient is whether the binary was built with support for modular feature "PeerAPI client support".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_peerapiclient" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasPeerAPIClient = true

feature/buildfeatures/feature_peerapiserver_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_peerapiserver
+
+package buildfeatures
+
+// HasPeerAPIServer is whether the binary was built with support for modular feature "PeerAPI server support".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_peerapiserver" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasPeerAPIServer = false

feature/buildfeatures/feature_peerapiserver_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_peerapiserver
+
+package buildfeatures
+
+// HasPeerAPIServer is whether the binary was built with support for modular feature "PeerAPI server support".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_peerapiserver" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasPeerAPIServer = true

feature/buildfeatures/feature_useexitnode_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_useexitnode
+
+package buildfeatures
+
+// HasUseExitNode is whether the binary was built with support for modular feature "Use exit nodes".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_useexitnode" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasUseExitNode = false

feature/buildfeatures/feature_useexitnode_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_useexitnode
+
+package buildfeatures
+
+// HasUseExitNode is whether the binary was built with support for modular feature "Use exit nodes".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_useexitnode" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasUseExitNode = true

feature/buildfeatures/feature_useroutes_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_useroutes
+
+package buildfeatures
+
+// HasUseRoutes is whether the binary was built with support for modular feature "Use routes advertised by other nodes".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_useroutes" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasUseRoutes = false

feature/buildfeatures/feature_useroutes_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_useroutes
+
+package buildfeatures
+
+// HasUseRoutes is whether the binary was built with support for modular feature "Use routes advertised by other nodes".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_useroutes" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasUseRoutes = true