graphics/mesa-demos: Stop shipping programs that upstream don't ship
Stop thinking we are better than upstream and don't ship programs
that upstream don't
This removes :
- eglgears_x11
- eglkms (which segfaults anyway)
- egltri_x11
- peglgears (stuck in a loop)
- xeglgears
- xeglthreads (doesn't work)
Differential Revision: https://reviews.freebsd.org/D44968
Sponsored by: Beckhoff Automation GmbH & Co. KG