[PATCH 0/3] Fixes for xserver 1.7

[Michel Dänzer]

Keith, please merge these to master and I'll cherry-pick them to
server-1.7-nominations (unless someone beats me to it - I'll be on vacation
for the next three weeks and thus less active).

[PATCH 1/3] EXA: Fix exaTryDriverSolidFill() for solid source pictures.
[PATCH 2/3] EXA: fix exaGetRGBAFromPixel to not loop forever on PICT_a8 pictures
[PATCH 3/3] composite: Revert changes from adding support for BGRA picture formats.