More mod_lua compat for Lua 5.1, 5.2, 5.3.

One last use of luaL_register() with a non-NULL
"name" argument remaining.

Not tested yet.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1800815 13f79535-47bb-0310-9956-ffa450edef68