all: go fix -fix=buildtag std cmd (except for bootstrap deps, vendor)

When these packages are released as part of Go 1.18,
Go 1.16 will no longer be supported, so we can remove
the +build tags in these files.

Ran go fix -fix=buildtag std cmd and then reverted the bootstrapDirs
as defined in src/cmd/dist/buildtool.go, which need to continue
to build with Go 1.4 for now.

Also reverted src/vendor and src/cmd/vendor, which will need
to be updated in their own repos first.

Manual changes in runtime/pprof/mprof_test.go to adjust line numbers.

For #41184.

Change-Id: Ic0f93f7091295b6abc76ed5cd6e6746e1280861e
Reviewed-on: https://go-review.googlesource.com/c/go/+/344955
Trust: Russ Cox <[email protected]>
Run-TryBot: Russ Cox <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Bryan C. Mills <[email protected]>

Author: rsc

src/archive/tar/stat_actime1.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build aix || linux || dragonfly || openbsd || solaris
-// +build aix linux dragonfly openbsd solaris
 
 package tar
 

src/archive/tar/stat_actime2.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build darwin || freebsd || netbsd
-// +build darwin freebsd netbsd
 
 package tar
 

src/archive/tar/stat_unix.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build aix || linux || darwin || dragonfly || freebsd || openbsd || netbsd || solaris
-// +build aix linux darwin dragonfly freebsd openbsd netbsd solaris
 
 package tar
 

src/bytes/boundary_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 //
 //go:build linux
-// +build linux
 
 package bytes_test
 

src/cmd/api/run.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build ignore
-// +build ignore
 
 // The run program is invoked via the dist tool.
 // To invoke manually: go tool dist test -run api --no-rebuild

src/cmd/go/go11.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build go1.1
-// +build go1.1
 
 package main
 

src/cmd/go/go_unix_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package main_test
 

src/cmd/go/internal/base/signal_notunix.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build plan9 || windows
-// +build plan9 windows
 
 package base
 

src/cmd/go/internal/base/signal_unix.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build aix || darwin || dragonfly || freebsd || js || linux || netbsd || openbsd || solaris
-// +build aix darwin dragonfly freebsd js linux netbsd openbsd solaris
 
 package base
 

src/cmd/go/internal/lockedfile/internal/filelock/filelock_fcntl.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build aix || (solaris && !illumos)
-// +build aix solaris,!illumos
 
 // This code implements the filelock API using POSIX 'fcntl' locks, which attach
 // to an (inode, process) pair rather than a file descriptor. To avoid unlocking