cmd/go/internal/work: whitelist tvOS and watchOS compiler flags

Updates #22395

Change-Id: I6c207934b32d38374875f756c4f8c6dfe38d8cb0
Reviewed-on: https://go-review.googlesource.com/c/go/+/168318
Run-TryBot: Elias Naur <mail@eliasnaur.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/go/internal/work/security.go

@@ -101,6 +101,10 @@ var validCompilerFlags = []*lazyregexp.Regexp{
 	re(`-mmacosx-(.+)`),
 	re(`-mios-simulator-version-min=(.+)`),
 	re(`-miphoneos-version-min=(.+)`),
+	re(`-mtvos-simulator-version-min=(.+)`),
+	re(`-mtvos-version-min=(.+)`),
+	re(`-mwatchos-simulator-version-min=(.+)`),
+	re(`-mwatchos-version-min=(.+)`),
 	re(`-mnop-fun-dllimport`),
 	re(`-m(no-)?sse[0-9.]*`),
 	re(`-m(no-)?ssse3`),