Add option for XDarwin to track system keyboard layout changes as they

occur (John Harper and Torrey T. Lyons).

hw/darwin/quartz/quartzKeyboard.c

@@ -148,7 +148,7 @@ const static struct {
 };
 
 unsigned int
-DarwinSystemKeymapSeed (void)
+DarwinModeSystemKeymapSeed (void)
 {
     static unsigned int seed;
 
@@ -373,6 +373,12 @@ DarwinModeReadSystemKeymap (darwinKeyboardInfo *info)
 
 #else /* !HAS_KL_API */
 
+unsigned int
+DarwinModeSystemKeymapSeed (void)
+{
+    return 0;
+}
+
 Bool
 DarwinModeReadSystemKeymap (darwinKeyboardInfo *info)
 {