main/xf86-video-intel: upgrade to 2.99.917_git20191210
Support Gen9 integrated graphics
fixes
MESA-LOADER: failed to retrieve device information
MESA-LOADER: failed to retrieve device information
i915g: driver missing
libGL error: failed to create dri screen
libGL error: failed to load driver: iris
and
(II) intel(0): SNA initialized with disabled backend