CLEANUP: include: remove unused common/tools.h

Let's definitely get rid of this old file.
diff --git a/include/common/tools.h b/include/common/tools.h
deleted file mode 100644
index e663ec2..0000000
--- a/include/common/tools.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * include/common/tools.h
- * Trivial macros needed everywhere.
- *
- * Copyright (C) 2000-2011 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_TOOLS_H
-#define _COMMON_TOOLS_H
-
-#endif /* _COMMON_TOOLS_H */
-
-/*
- * Local variables:
- *  c-indent-level: 8
- *  c-basic-offset: 8
- * End:
- */
diff --git a/include/haproxy/api.h b/include/haproxy/api.h
index 305e860..66165b1 100644
--- a/include/haproxy/api.h
+++ b/include/haproxy/api.h
@@ -31,7 +31,6 @@
 #define _HAPROXY_BASE_H
 
 #include <common/initcall.h>
-#include <common/tools.h>
 #include <haproxy/api-t.h>
 
 #endif