Disable misc ubsan Soong test on mac

Test: run on mac build
Change-Id: I869775ce76fd619557bf6833f99c5b924bcc5a8e
diff --git a/cc/sanitize_test.go b/cc/sanitize_test.go
index 580adfa..b102d33 100644
--- a/cc/sanitize_test.go
+++ b/cc/sanitize_test.go
@@ -314,6 +314,10 @@
 }
 
 func TestMiscUndefined(t *testing.T) {
+	if runtime.GOOS != "linux" {
+		t.Skip("requires linux")
+	}
+
 	bp := `
 	cc_binary {
 		name: "bin_with_ubsan",