CLEANUP: include: remove common/config.h

It was already an indirection to load other files, it's not used
anymore.
diff --git a/include/common/config.h b/include/common/config.h
deleted file mode 100644
index 49d219c..0000000
--- a/include/common/config.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * include/common/config.h
- * This files contains most of the user-configurable settings.
- *
- * Copyright (C) 2000-2009 Willy Tarreau - w@1wt.eu
- *
- * This library 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, version 2.1
- * exclusively.
- *
- * 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- */
-
-#ifndef _COMMON_CONFIG_H
-#define _COMMON_CONFIG_H
-
-#include <haproxy/api.h>
-
-#endif /* _COMMON_CONFIG_H */