package/libva: fix mesa3d glx support
https://git.buildroot.net/buildroot/commit/package/mesa3d?id=
5cb821d5635626b7327d5d704555c412e5ed5a1f
added a new option to enable GLX support.
This patch adjusts libva to use the new logic.
Fixes:
http://autobuild.buildroot.net/results/797/
79776104e681402c24160be15789fe67bb69f833/
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Reviewed-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>