Sync LED state when gaining focus

The state might have changed when we didn't have focus. Get
everything back in sync once we're back in control.
diff --git a/vncviewer/cocoa.h b/vncviewer/cocoa.h
index b5d5f76..a713802 100644
--- a/vncviewer/cocoa.h
+++ b/vncviewer/cocoa.h
@@ -36,4 +36,7 @@
 int cocoa_set_caps_lock_state(bool on);
 int cocoa_set_num_lock_state(bool on);
 
+int cocoa_get_caps_lock_state(bool *on);
+int cocoa_get_num_lock_state(bool *on);
+
 #endif