[release-branch.go1.25] cmd/go: fix pkg-config flag sanitization
Implement a new pkg-config safe flag list (containing everything except
for --log-file) and use that when checking flags passed to pkg-config,
instead of using checkCompilerFlags.
Updates #77387
Fixes #77438
Change-Id: Id6141d0a2934053aa43e3aa8ce402bd499c4c028
Reviewed-on: https://go-review.googlesource.com/c/go/+/741042
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
(cherry picked from commit
28fbdf7acb4146b5bc3d88128e407d1344691839)
Reviewed-on: https://go-review.googlesource.com/c/go/+/745481
Reviewed-by: David Chase <drchase@google.com>