mod_lua: Fully sync 2.4.x with trunk (catch up to r1490700):

2.4.x patch: http://www.humbedooh.com/mod_lua_2013_06_07.patch
Submitted by: humbedooh
Reviewed by: fuankg, minfrin


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1491468 13f79535-47bb-0310-9956-ffa450edef68