[MINOR] added include/common/debug.h

This file will provide debugging macros such as DPRINTF.

include/common/debug.h

@@ -0,0 +1,33 @@
+/*
+  include/common/debug.h
+  This files contains some macros to help debugging.
+
+  Copyright (C) 2000-2006 Willy Tarreau - [email protected]
+  
+  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_DEBUG_H
+#define _COMMON_DEBUG_H
+
+#include <common/config.h>
+
+#ifdef DEBUG_FULL
+#define DPRINTF(x...) fprintf(args)
+#else
+#define DPRINTF(x...)
+#endif
+
+#endif /* _COMMON_DEBUG_H */