lua header update part 1: EDOESNOTBUILD.

First include mod_lua which sets LUA_COMPAT_ALL,
then lua.h which uses it.

Needed at least to build with lua 5.2.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1479718 13f79535-47bb-0310-9956-ffa450edef68