updates for xorg-server 1.20:

- xf86GetOS()/LoaderGetOS() have been replaced. replace them with
direct platform #ifdefs for now.
- shadowUpdatePackedWeak() is gone, use local thunks.
- xf86DisableRandR() is gone, disable it (should be obsolete)

adapt to new xserver API

clean up header files for this (local) driver. don't need a config.h.
partly ported to xorg-server 1.18, but needs compat-api.h treatment.

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.

clang appeasement

use WSDISPLAYIO_MODE_MAPPED

add NoAccel option, general cleanup

return FALSE;

more includes and abi issues.

tell the Xserver that we need PIO access ( even though it's only for probing )

fix the previous - use GET_ABI_MAJOR(ABI_VIDEODRV_VERSION) > 6.

avoid xf86Resources/xf86RAC for GET_ABI_MAJOR(ABI_VIDEODRV_VERSION) < 6.

copy a hack from the vmware driver, and avoid using xf86LoaderReqSymLists()
and LoaderRefSymLists() in xorg-server >= 1.7.

pick up some nits accidentially left in:
- get rid of usleep() while waiting for the blitter - way too crude
- sanitize some register writes
since last time I looked at this some other problem crept in - we now have
syncing issues with text drawing

A driver for IGS CyberPro 20x0 graphics controllers.
So far this works only on Rev. 5 Sharks with igsfb, adapting it to netwinder
should be trivial though.