tests: Only run buffer-count test on Mesa >= 10.1

Comment #2 in the bug report says Mesa 10.0 branch does not have the
fix, and indeed buffer-count test fails on Mesa 10.0.1. Fix the test to
require Mesa 10.1 or later.

Now I correctly get:
	mesa version too old (OpenGL ES 3.0 Mesa 10.0.1 (git-12484d2))

https://bugs.freedesktop.org/show_bug.cgi?id=72835

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
1 file changed