shortcut_to_name should not be defined as static in a header file. Put

it in group.c where it it used most, and add an extern definition for
the other users of it.

Found by gcc -Wall. ok okan@

group.c

@@ -29,6 +29,11 @@ struct group_ctx	 Groups[CALMWM_NGROUPS];
 int			 Grouphideall = 0;
 struct group_ctx_q	 Groupq;
 
+const char *shortcut_to_name[] = {
+        "nogroup", "one", "two", "three", "four", "five", "six",
+        "seven", "eight", "nine"
+};
+
 static void
 _group_add(struct group_ctx *gc, struct client_ctx *cc)
 {