Remove ffserver.h

It's unused an serves no purpose.

ffserver.h

@@ -1,29 +0,0 @@
-/*
- * Multiple format streaming server
- * copyright (c) 2002 Fabrice Bellard
- *
- * This file is part of Libav.
- *
- * Libav is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * Libav 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef LIBAV_FFSERVER_H
-#define LIBAV_FFSERVER_H
-
-/* interface between ffserver and modules */
-
-void ffserver_module_init(void);
-
-#endif /* LIBAV_FFSERVER_H */