package/mesa3d-demos: Disable glesv1 support

The only files enabled by glesv1 support are in src/egl/opengles1/

Quoting src/egl/opengles1/Makefile.am:

"# These programs aren't intended to be included with the normal distro."
"# They're not too interesting but they're good for testing."

Most of the files present in this directory contain

"#include <X11/Xlib.h>"

which breaks a wayland-only build because the build system does not take
care of the x11 dependency here. Since these files are "not too
interesting" anyway we just disable glesv1 support.

Fixes
http://autobuild.buildroot.net/results/b3e/b3ed3ee174a3ddce84bf64039eac39d4e6e75b71/



[Thomas: adapt on top of master.]

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