Here is a more faithful fix for the mod_include/table_xxxn API problem.

We preserve all the original functionality at the expense of some extra
memory because we don't clean up subrequests.

Plus a bug is fixed -- if mod_include is not the only module using
run_sub_request() then it was possible that add_xxx_vars() wouldn't be
done, and the environment would be incorrect.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80089 13f79535-47bb-0310-9956-ffa450edef68