Update Mesa to a commit enabling virgl on softpipe to advertise
GL 3.x and beyond. This will allow us to support desktop GL CI tests
in upcoming commits.
This newer Mesa version also fixes a few gles31 tests, so update results
in the ci/previous_results directory accordingly.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-By: Gert Wollny <gert.wollny@collabora.com>