- For all drivers that have a <driver>.sgml file, add code in their build

system to build the README file at make dist time
- in util/macros/xorg-macros.m4, add a new XORG_CHECK_LINUXDOC macro that
    will check if the required tools and files exist, and if so set a
    conditional.
- util/modular/symlink.sh
- Link all the <driver>.sgml to xf86-video-<driver>/README.sgml
- Add all the README.<driver> to the list of excluded files
- xc/programs/Xserver/hw/xfree86/doc/sgml/SiS.sgml: Various changes to make
    it spew less warnings when the text file is built.

Makefile.am

@@ -20,3 +20,14 @@
 
 AUTOMAKE_OPTIONS = foreign
 SUBDIRS = src man
+
+if BUILD_LINUXDOC
+README.ati: README.ati.sgml
+	$(MAKE_TEXT) README.ati.sgml && mv README.ati.txt README.ati
+
+README.r128: README.r128.sgml
+	$(MAKE_TEXT) README.r128.sgml && mv README.r128.txt README.r128
+
+endif
+
+EXTRA_DIST = README.ati README.r128 README.ati.sgml README.r128.sgml