Xnest: disable XKB, reshuffle code

Disable XKB, as we can't yet use it; move Composite disabling to
ddxInitGlobals, along with XKB.

hw/xnest/Args.c

@@ -53,18 +53,21 @@ Window xnestParentWindow = 0;
 /* ddxInitGlobals - called by |InitGlobals| from os/util.c */
 void ddxInitGlobals(void)
 {
-}
-
-int
-ddxProcessArgument (int argc, char *argv[], int i)
-{
-
 #ifdef COMPOSITE
     /* XXX terrible hack */
     extern Bool noCompositeExtension;
     noCompositeExtension = TRUE;
 #endif
 
+#ifdef XKB
+    extern Bool noXkbExtension;
+    noXkbExtension = TRUE;
+#endif
+}
+
+int
+ddxProcessArgument (int argc, char *argv[], int i)
+{
   if (!strcmp(argv[i], "-display")) {
     if (++i < argc) {
       xnestDisplayName = argv[i];