Remove wmlib

was this ever used for anything? i checked a couple hundred dockapps,
no joy; there's nothing in debian (afaict) that build-depends on it,
so let's try doing away with it.

wmlib/app.h

@@ -1,40 +0,0 @@
-/* app.h - private declarations for application context
- *
- * WMlib - WindowMaker application programming interface
- *
- * Copyright (C) 1997-2003 Alfredo K. Kojima
- *
- *  This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Library General Public
- *  License as published by the Free Software Foundation; either
- *  version 2 of the License, or (at your option) any later version.
- *
- *  This library is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  Library General Public License for more details.
- *
- *  You should have received a copy of the GNU Library General Public
- *  License along with this library; if not, write to the Free
- *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#ifndef _APP_H_
-#define _APP_H_
-
-typedef struct _wmAppContext {
-    Display *dpy;
-    int screen_number;
-
-    int our_leader_hint;	       /* if app leader hint was set by us */
-    Window main_window;		       /* main window of the application */
-    Window *windows;
-    int win_count;		       /* size of windows array */
-
-    WMMenu *main_menu;
-
-    int last_menu_tag;
-} wmAppContext;
-
-#endif
-