[release-branch.go1.10] cmd/go: add GOMIPS value to build id for mipsle
Strip a trailing "le" from the GOARCH value when calculating the GOxxx
environment variable that affects it.
Updates #27260
Fixes #27421
Change-Id: I081f30d5dc19281901551823f4f56be028b5f71a
Reviewed-on: https://go-review.googlesource.com/131379
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit
61318d7ffe8a49e9dedc5aa8195a164a3821465c)
Reviewed-on: https://go-review.googlesource.com/c/146560
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>