cmd/go/internal/script: Fix build tags of isETXTBSY

syscall.ETXTBSY is only meaningful on Unix platforms, not on Windows.

Fixes #67356

Change-Id: I1b13292d821d61d820b396e08be9a4dd1683e843
Reviewed-on: https://go-review.googlesource.com/c/go/+/585695
Reviewed-by: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Michael Matloob <[email protected]>

Author: hnakamur

src/cmd/go/internal/script/cmds_other.go renamed to src/cmd/go/internal/script/cmds_nonunix.go

@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !(unix || windows)
+//go:build !unix
 
 package script
 
 func isETXTBSY(err error) bool {
+	// syscall.ETXTBSY is only meaningful on Unix platforms.
 	return false
 }

src/cmd/go/internal/script/cmds_posix.go renamed to src/cmd/go/internal/script/cmds_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || windows
+//go:build unix
 
 package script