detail (macro should "use" all its arguments)

luaconf.h

@@ -1,5 +1,5 @@
 /*
-** $Id: luaconf.h,v 1.253 2015/06/24 18:23:57 roberto Exp roberto $
+** $Id: luaconf.h,v 1.254 2015/10/21 18:17:40 roberto Exp roberto $
 ** Configuration file for Lua
 ** See Copyright Notice in lua.h
 */
@@ -612,7 +612,7 @@
 ** provide its own implementation.
 */
 #if !defined(LUA_USE_C89)
-#define lua_number2strx(L,b,sz,f,n)	l_sprintf(b,sz,f,n)
+#define lua_number2strx(L,b,sz,f,n)	((void)L, l_sprintf(b,sz,f,n))
 #endif