cmd/go: set environment LANG=C when getting compiler version
Compiler's version will not work well if gcc output have
different language. Like 'gcc -v', it may not output:
'gcc version xx.xx.x'
Fixes #69221
Change-Id: I4adcea79dfaaf5853dfb6e718468f8530c67da6a
GitHub-Last-Rev:
069787c0836f9be10e4bf71dd6c468ae47f6161e
GitHub-Pull-Request: golang/go#69223
Reviewed-on: https://go-review.googlesource.com/c/go/+/610215
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: DING HU <huzuzong123@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>