Add an API function remove_module() to remove a module structure from the

linked list of module structures. This is called by the dynamic module
modules (mod_dll, mod_so) when a module is unloaded. This should only ever
be called during a restart since it invalidates per-dir and per-server
vectors.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80139 13f79535-47bb-0310-9956-ffa450edef68