The host GOARCH is most likely supported (386, amd64, arm, arm64).

Change-Id: I86324b9c00f22c592ba54bda7d2ae97c86bda904
Reviewed-on: https://go-review.googlesource.com/99155
Run-TryBot: Elias Naur <elias.naur@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>