Lubomir Rintel authored Dec 25, 2019 and Adam Jackson committed Jan 08, 2020

The Etnaviv driver on GC2000 reports desktop OpenGL 1.3 but also OpenGL ES 2.0.
However, with the modesetting driver, GLES2 never gets a chance:

  [ 11233.393] Require OpenGL version 2.1 or later.
  [ 11233.393] (EE) modeset(0): Failed to initialize glamor at ScreenInit() time.
  [ 11233.393] (EE)
  Fatal server error:
  [ 11233.395] (EE) AddScreen/ScreenInit failed for driver 0

Let's reject old desktop GL early on, just like XWayland seems to do.

This is perhaps a slightly bit more complicated that one would expect, since we
need to call eglMakeCurrent() before we query the GL version.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>