i965: Use the shared intel_pixel_copy.c.

i965: Use the shared intel_pixel_copy.c.

This disables the textured copy implementation on 965, which didn't appear
to work (mesa copypix demo, disable the blit path, move so that regions don't
overlap and textured is used, and you get garbage).  If we resurrect this for
i965, I'd rather it used the 915-style metaops instead.  Current metaops code
left in place so that whoever picks it up has a reference.