Fix memset use.
include xorg-server.h which is normally included by config.h. (as an unmaintained version, this change doubly isn't a candidate for upstream.)
mibstore.h and its miInitializeBackingStore() have been otherwise empty since at least xorg-server 1.10. remove all reference to them as the header is gone in xorg-server 1.18.
fix const issues (Q+D)
Make it work with xorg-server-1.10.6.
Initial import of xf86-video-intel 2.9.1. This is the final version of the driver with UMS support.