Supress error message if dlopen for jack.so failed

This is mainly happening when there's no jack installed
in the system and no reason to cause general panic
messages in the terminal about this.

intern/audaspace/jack/AUD_JackLibrary.cpp

@@ -47,7 +47,6 @@ void AUD_jack_init(void)
 	jack_handle = dlopen("libjack.so", RTLD_LAZY);
 
 	if (!jack_handle) {
-		fprintf(stderr, "%s\n", dlerror());
 		return;
 	}