cmd/buildlet: fix bash wrapper check for iOS

Updates golang/go#41610

Change-Id: I9a2e151eaf8104e2f3a1a8d36f8dc72a6351fd4a
Reviewed-on: https://go-review.googlesource.com/c/build/+/259580
Trust: Elias Naur <mail@eliasnaur.com>
Run-TryBot: Elias Naur <mail@eliasnaur.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

cmd/buildlet/buildlet.go

@@ -995,7 +995,7 @@ func needsBashWrapper(cmd string) bool {
 		return false
 	}
 	// The mobile platforms can't execute shell scripts directly.
-	ismobile := runtime.GOOS == "android" || runtime.GOOS == "darwin" && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64")
+	ismobile := runtime.GOOS == "android" || runtime.GOOS == "ios"
 	return ismobile
 }