The buildtag fixer has been incorporated into the vet analyzer
of the same name; all other fixers were already no-ops since
CL 695855.
Fixes #73605
Updates #71859
Change-Id: I90b6c730849a5ecbac3e6fb6fc0e062b5de74831
Reviewed-on: https://go-review.googlesource.com/c/go/+/706758 Reviewed-by: Michael Matloob <matloob@golang.org> Reviewed-by: Michael Matloob <matloob@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>