sprinkle volatile for gcc 5.4, also include config.h

if the hardware supports stipples with ROPs, use them
while there, downgrade some config output from X_ERROR to X_PROBED

detect and (attempt to) deal with 8bit TCX with 2MB VRAM
TODO: get one of these VRAM modules...

re-add tcx_accel.c

merge xf86-video-suncg14 1.1.2, xf86-video-suncg6 1.1.2,
xf86-video-sunffb 1.2.2, xf86-video-suntcx 1.1.2 and xf86-video-sunleo 1.2.1

XXX: these might need more help

fix a logic botch in TcxCopy() that would bite us when doing right-to-left
blits with width being a multiple of 32

Make TcxDownloadFromScreen() and TcxUploadToScreen() work and use them.

fix typo

Support acceleration on 8bit TCX. This is untested for lack of hardware.

add acceleration support, make hardware cursor work, etc.
the acceleration code will not work on 8 bit TCX yet.