Add mod_deflate (formerly known as mod_gz) to experimental. mod_deflate

supports gzip transfer-encoding as an output filter.

Initially coded by Ian, but Justin made a number of improvements to
the coding style and its use of filters.

We have 7 binding +1s and no vetos in STATUS for addition.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92108 13f79535-47bb-0310-9956-ffa450edef68