automake: Convert src/mesa/drivers/x11/Makefile to automake.

The weird versioning of the libGL where the package version was sort
of expressed as a big integer is dropped.  libtool didn't like the 0
prefix, and it didn't really make sense anyway -- if you interpret it
as an integer version number, old Mesa 071200 was bigger than current
Mesa 08100.  Instead, just bump the minor version and drop the
patchlevel.
diff --git a/configure.ac b/configure.ac
index 6d4d6d2..532feaa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2184,7 +2184,8 @@
 		src/mesa/drivers/dri/nouveau/Makefile
 		src/mesa/drivers/dri/r200/Makefile
 		src/mesa/drivers/dri/radeon/Makefile
-		src/mesa/drivers/dri/swrast/Makefile])
+		src/mesa/drivers/dri/swrast/Makefile
+		src/mesa/drivers/x11/Makefile])
 
 dnl Sort the dirs alphabetically
 GALLIUM_TARGET_DIRS=`echo $GALLIUM_TARGET_DIRS|tr " " "\n"|sort -u|tr "\n" " "`