Drop the generic C implementation of pixman_blt patch, upstream refuses to
accept generic implementations as the policy is that the caller provides generic
paths, and this patch was only used in conjunction with a matching patch in
xserver-xorg which we don't carry anymore.
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>