runtime: skip crash test on android

LGTM=bradfitz
R=golang-codereviews, bradfitz, minux
CC=golang-codereviews
https://golang.org/cl/110400043

src/pkg/runtime/crash_test.go

@@ -32,8 +32,9 @@ func testEnv(cmd *exec.Cmd) *exec.Cmd {
 }
 
 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)

src/pkg/runtime/runtime_test.go

@@ -95,8 +95,9 @@ func BenchmarkDeferMany(b *testing.B) {
 // The value reported will include the padding between runtime.gogo and the
 // next function in memory. That's fine.
 func TestRuntimeGogoBytes(t *testing.T) {
-	if GOOS == "nacl" {
-		t.Skip("skipping on nacl")
+	switch GOOS {
+	case "android", "nacl":
+		t.Skipf("skipping on %s", GOOS)
 	}
 
 	dir, err := ioutil.TempDir("", "go-build")