VLC needs QT_GUI_MODULE and not just QT

fixes http://autobuild.buildroot.net/results/78d/78df2d86394d7637db88dac5d1e3c7b4a27af293/

Signed-off-by: Jérémy Rosen <jeremy.rosen@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/vlc/vlc.mk

@@ -204,7 +204,7 @@ else
 VLC_CONF_OPT += --disable-lua
 endif
 
-ifeq ($(BR2_PACKAGE_QT),y)
+ifeq ($(BR2_PACKAGE_QT_GUI_MODULE),y)
 VLC_CONF_OPT += --enable-qt
 VLC_DEPENDENCIES += qt
 else