runtime: skip crash test on android

LGTM=bradfitz
R=golang-codereviews, bradfitz, minux
CC=golang-codereviews
https://golang.org/cl/110400043
diff --git a/src/pkg/runtime/crash_test.go b/src/pkg/runtime/crash_test.go
index b0277f2..8552d2f 100644
--- a/src/pkg/runtime/crash_test.go
+++ b/src/pkg/runtime/crash_test.go
@@ -32,8 +32,9 @@
 }
 
 func executeTest(t *testing.T, templ string, data interface{}) string {
-	if runtime.GOOS == "nacl" {
-		t.Skip("skipping on nacl")
+	switch runtime.GOOS {
+	case "android", "nacl":
+		t.Skipf("skipping on %s", runtime.GOOS)
 	}
 
 	checkStaleRuntime(t)