meson: fix graw-xlib after auxiliary consolidation
This one's completely my fault, I didn't do good enough testing after rebasing and this got missed. Fixes: d28c2465 ("meson: build graw tests") Signed-off-by:Dylan Baker <dylan.c.baker@intel.com> Reviewed-by:
Eric Anholt <eric@anholt.net> (cherry picked from commit 1546f76a)