xf86-video-s3: fix building with current xorg-server.
To do this, bring in a copy of the previous RAMDAC code into the tree, and then modify Makefile.am to make sure that we build it. Then change the include path for the relevant headers to the src/ramdac directory.
The RAMDAC code was removed from xorg-server in 21.0.99.1. Most drivers are able to work without including RAMDAC code, but the S3 driver appears to be using it in several places which would require significant modifications.
Tested on Linux From Scratch 11.3 i686 and x86_64, on an industrial system that still needed the S3 driver.
Signed-off-by: Douglas R. Reno renodr@linuxfromscratch.org