cmd/dist: really skip the testsanitizers tests on Android

The test.bash script in misc/cgo/testsanitizers use GOOS, not GOHOSTOS.
Fix the dist check from gohostos to goos accordingly.

The error was masked on the builders because they run on a darwin host
where the sanitizers tests never ran.

With this change, the Android test suite completes successfully on
Android/amd64.

Change-Id: Id7690429f78c6ac7a26fc9118d913b719b565bb2
Reviewed-on: https://go-review.googlesource.com/35959Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Elias Naur <elias.naur@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/dist/test.go

@@ -567,7 +567,7 @@ func (t *tester) registerTests() {
 		if t.gohostos == "linux" && t.goarch == "amd64" {
 			t.registerTest("testasan", "../misc/cgo/testasan", "go", "run", "main.go")
 		}
-		if t.gohostos == "linux" && t.goarch == "amd64" {
+		if t.goos == "linux" && t.goarch == "amd64" {
 			t.registerTest("testsanitizers", "../misc/cgo/testsanitizers", "./test.bash")
 		}
 		if t.hasBash() && t.goos != "android" && !t.iOS() && t.gohostos != "windows" {