[release-branch.go1.24] internal/godebugs: add fips140 as an opaque godebug setting
This permits using "godebug fips140=on" in go.mod and
using "//go:debug fips140=on" in the main package.
Change code references to the godebug setting to remove the #
which is no longer required.
For #71666
Fixes #71745
Change-Id: I3a60ecc55b03848dadd6d431eb43137b6df6568b
Reviewed-on: https://go-review.googlesource.com/c/go/+/649495
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
(cherry picked from commit
2b43ce0a9d5825d66aa42a6fa9076f2fb9c181ea)
Reviewed-on: https://go-review.googlesource.com/c/go/+/650675
Commit-Queue: Ian Lance Taylor <iant@google.com>