get rid of XFree86LOADER, XFree86Server, XFree86Module, and IN_MODULE

Get rid of almost all uses of these definitions.  They're still defined for
delinquent out-of-tree drivers, and also for the Mesa build.  As well as
for miinitext.c.  But largely gone.

GL/mesa/array_cache/Makefile.am

@@ -2,9 +2,7 @@ noinst_LTLIBRARIES = libac.la
 
 AM_CFLAGS = \
 	$(DIX_CFLAGS) \
-	@SERVER_DEFINES@ \
-	@MODULE_DEFINES@ \
-	@LOADER_DEFINES@ \
+	-DXFree86Server \
 	@GLX_DEFINES@
 
 INCLUDES = -I@MESA_SOURCE@/include \