Add a pointer to the filter_rec_t from the filter_t. This allows modules

to get to the filter name from the filter itself.  This is useful for
modules like mod_perl, which have one filter function that does different
things based on the name used when the filter was inserted.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86221 13f79535-47bb-0310-9956-ffa450edef68