package/vlc: use only glesv2, not glesv1

Fixes
http://autobuild.buildroot.net/results/0be/0bee8646c2dd7dd2c201ee2986f3e802277314a5/
http://autobuild.buildroot.net/results/64a/64a1a6d39b72b9dec4231b9f28ca14b38989d7df/
http://autobuild.buildroot.net/results/b6b/b6b66e0b24d985462ca8dbefedd740453ca42293/
http://autobuild.buildroot.net/results/497/4976f5e9dc53e6f9f29d9d45f0fb9bd42c7ab1ea/



and many others

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>