Get mod_rewrite to work as a DSO by changing the way it

keeps track of whether or not its post config hook has
been called before.  Instead of a static variable (which
is replaced when the DSO is loaded a second time), use
userdata in the process pool.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87328 13f79535-47bb-0310-9956-ffa450edef68