package/mesa3d-demos: bump version to 8.3.0

package/mesa3d-demos: bump version to 8.3.0

Currently buildroot lacks glut support so add configure options to
disable glut support, also disable osmesa support because it also
depends on glut.

Re-numbered and rebased 0001-demos-optional-gl.patch

Removed patches:
- 0001-demos-non-mesa-impl.patch
All files related to this patch have been removed upstream:
http://cgit.freedesktop.org/mesa/demos/commit/?id=74443c6ee79f3251f643ea05e94df58183e37d0d

- 0003-demos-x11-fix.patch
Applied upstream:
http://cgit.freedesktop.org/mesa/demos/commit/?id=6f7ad3f242943242021d1c42c6ed6933b76137fd

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