glamor: Fix copy-like Render operations between 15 and 16 depth.
Reading and writing to 16-depth pixmaps using PICT_x1r5g5b5 ends up failing, unless you're doing a straight copy at the same bpp where the misinterpretation matches on both sides. Fixes rendercheck/blend/over and renderhceck/blend/src in piglit. Please cherry-pick this to active stable branches. Signed-off-by: Eric Anholt <email@example.com> Reviewed-by: Dave Airlie <firstname.lastname@example.org>
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