merge xf86-video- ast 1.0.1, cirrus 1.5.3, geode 2.11.17, mach64 6.9.5,
savage 2.3.8 and siliconmotion 1.7.8.

merge xf86-video-s3 0.6.5, xf86-video-s3virge 1.10.6, xf86-video-savage 2.3.6,
xf86-video-siliconmotion 1.7.7, xf86-video-sis 0.10.7.

make this work on Gdium ( and NetBSD in general )

initial import of xf86-video-siliconmotion-1.7.1