remove no-xlib warning

As no one complained about broken things I must assume it is working
perfectly. :)

vlc/libvlc.cpp

@@ -94,9 +94,6 @@ bool LibVLC::init()
         args << "--no-stats";
         args << "--no-video-title-show";
         args << "--album-art=0";
-#ifdef __GNUC__
-#warning TODO: no-xlib is on
-#endif
         args << "--no-xlib";
 
 #ifndef Q_OS_MAC