more xf86RamDac.h vs xf86Cursor.h.

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)

prune xrefs to xorgconfig

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

actually put some relevant information in the man page

add NoAccel option, general cleanup

return FALSE;

more includes and abi issues.

include compiler.h for inb/outb

all driver needed includes

don't declare inb/outb.

include for ioctl()

XXX: need to provide proper pio.h for arm if this is going to work.

add missing include

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.

sprinkle some more volatile

add a PrepareAccess method to make sure the drawing engine is idle before
trying to scribble into video memory
This should not be necessary but for some reason we need it here.

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

Make IgsDownloadFromScreen() and IgsUploadToScreen() actually work.
While there clean up some cargo-culted comments that no longer apply.

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.