Skip pthread_cond_signal/4-2.c on Emscripten since it does not support signals.

Author: juj

conformance/interfaces/pthread_cond_signal/4-2.c

@@ -211,7 +211,12 @@ int main (int argc, char * argv[])
 	pthread_t th_waiter, th_worker, th_sig1, th_sig2;
 	thestruct arg1, arg2;
 	struct sigaction sa;
-	
+
+#ifdef __EMSCRIPTEN__
+	printf("Test SKIPPED: signals are not supported in Emscripten.\n");
+	exit(0);
+#endif
+
 	output_init();
 
 	/* We need to register the signal handlers for the PROCESS */