Fix the build with -fno-common

Index: wmgeneral/wmgeneral.c
--- wmgeneral/wmgeneral.c.orig
+++ wmgeneral/wmgeneral.c
@@ -65,6 +65,8 @@ char		*Geometry = "";
 GC			NormalGC;
 XpmIcon		wmgen;
 Pixmap		pixmask;
+Display         *display;
+Window          Root, iconwin, win;
 
   /*****************/
  /* Mouse Regions */
