tempfork/x509: remove the bundle tag in our fork

We want to be able to omit from only one (not both)

tempfork/x509/pool_darwin_arm64.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !x509omitbundledroots
-
 package x509
 
 import (

tempfork/x509/root_darwin_arm64.go

@@ -4,8 +4,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !x509omitbundledroots
-
 package x509
 
 func loadSystemRoots() (*CertPool, error) {

tempfork/x509/root_darwin_arm_gen.go

@@ -97,8 +97,6 @@ const header = `
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !x509omitbundledroots
-
 package x509
 
 func loadSystemRoots() (*CertPool, error) {

tempfork/x509/root_omit.go

@@ -1,21 +0,0 @@
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build darwin,arm64,x509omitbundledroots
-
-// This file provides the loadSystemRoots func when the
-// "x509omitbundledroots" build tag has disabled bundling a copy,
-// which currently on happens on darwin/arm64 (root_darwin_arm64.go).
-// This then saves 256 KiB of binary size and another 560 KiB of
-// runtime memory size retaining the parsed roots forever. Constrained
-// environments can construct minimal x509 root CertPools on the fly
-// in the crypto/tls.Config.VerifyPeerCertificate hook.
-
-package x509
-
-import "errors"
-
-func loadSystemRoots() (*CertPool, error) {
-	return nil, errors.New("x509: system root bundling disabled")
-}

tempfork/x509/root_omit_test.go

@@ -1,22 +0,0 @@
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build darwin,arm64,x509omitbundledroots
-
-package x509
-
-import (
-	"strings"
-	"testing"
-)
-
-func TestOmitBundledRoots(t *testing.T) {
-	cp, err := loadSystemRoots()
-	if err == nil {
-		t.Fatalf("loadSystemRoots = (pool %p, error %v); want non-nil error", cp, err)
-	}
-	if !strings.Contains(err.Error(), "root bundling disabled") {
-		t.Errorf("unexpected error doesn't mention bundling: %v", err)
-	}
-}