cmd/go: fix -changed don`t print when GOFIPS140 is non-default
See https://github.com/golang/go/issues/70200#issuecomment-
2468562595,
GOFIPS140 value when building the toolchain (off when not set)
is the default value for GOFIPS140,
it is buildcfg.defaultGOFIPS140,
export as buildcfg.DefaultGOFIPS140 that can be used in the cmd/go.
For #70200
Change-Id: I5a4873a718eeefda8e65bfab51d9d3d5ad2c21b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/629996
Reviewed-by: Michael Matloob <matloob@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>