Fix startup on Android, oops

Forgot that we can't create android-compatible threads in global
constructors, for JNI reasons.

Common/Thread/ThreadUtil.cpp

@@ -30,10 +30,11 @@ AttachDetachFunc g_detach;
 void AttachThreadToJNI() {
 	if (g_attach) {
 		g_attach();
+	} else {
+		ERROR_LOG(Log::System, "Couldn't attach thread - g_attach not set");
 	}
 }
 
-
 void DetachThreadFromJNI() {
 	if (g_detach) {
 		g_detach();