bump mod_include's external API. The API is now more simple and expected

to be better extensible without breaking binary compatibility, since an
opaque pointer to internal structures is part of the public context.
(We can easily add APi functions that operate on this internal struct).

I've tried to keep this change as small as possible - sorry for the big
diff though, but the commit should be atomic. mod_cgi and mod_cgid won't
compile until the next commit, anyway.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@101046 13f79535-47bb-0310-9956-ffa450edef68