feature/featuretags, all: add build features, use existing ones in more places

Saves 270 KB.

Updates #12614

Change-Id: I4c3fe06d32c49edb3a4bb0758a8617d83f291cf5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

feature/buildfeatures/feature_bakedroots_disabled.go

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+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_bakedroots
+
+package buildfeatures
+
+// HasBakedRoots is whether the binary was built with support for modular feature "Embed CA (LetsEncrypt) x509 roots to use as fallback".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_bakedroots" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasBakedRoots = false

feature/buildfeatures/feature_bakedroots_enabled.go

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+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_bakedroots
+
+package buildfeatures
+
+// HasBakedRoots is whether the binary was built with support for modular feature "Embed CA (LetsEncrypt) x509 roots to use as fallback".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_bakedroots" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasBakedRoots = true

feature/buildfeatures/feature_cloud_disabled.go

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+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_cloud
+
+package buildfeatures
+
+// HasCloud is whether the binary was built with support for modular feature "detect cloud environment to learn instances IPs and DNS servers".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_cloud" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasCloud = false

feature/buildfeatures/feature_cloud_enabled.go

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+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_cloud
+
+package buildfeatures
+
+// HasCloud is whether the binary was built with support for modular feature "detect cloud environment to learn instances IPs and DNS servers".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_cloud" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasCloud = true

feature/buildfeatures/feature_listenrawdisco_disabled.go

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+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_listenrawdisco
+
+package buildfeatures
+
+// HasListenRawDisco is whether the binary was built with support for modular feature "Use raw sockets for more robust disco (NAT traversal) message receiving (Linux only)".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_listenrawdisco" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasListenRawDisco = false

feature/buildfeatures/feature_listenrawdisco_enabled.go

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+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_listenrawdisco
+
+package buildfeatures
+
+// HasListenRawDisco is whether the binary was built with support for modular feature "Use raw sockets for more robust disco (NAT traversal) message receiving (Linux only)".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_listenrawdisco" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasListenRawDisco = true

feature/buildfeatures/feature_unixsocketidentity_disabled.go

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+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_unixsocketidentity
+
+package buildfeatures
+
+// HasUnixSocketIdentity is whether the binary was built with support for modular feature "differentiate between users accessing the LocalAPI over unix sockets (if omitted, all users have full access)".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_unixsocketidentity" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasUnixSocketIdentity = false

feature/buildfeatures/feature_unixsocketidentity_enabled.go

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+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_unixsocketidentity
+
+package buildfeatures
+
+// HasUnixSocketIdentity is whether the binary was built with support for modular feature "differentiate between users accessing the LocalAPI over unix sockets (if omitted, all users have full access)".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_unixsocketidentity" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasUnixSocketIdentity = true