mod_proxy: Fixup UDS filename for mod_proxy called through r->handler.

mod_proxy: Fixup UDS filename for mod_proxy called through r->handler.

* modules/proxy/proxy_util.c:
  Export ap_proxy_fixup_uds_filename() from fix_uds_filename.
  Call it from ap_proxy_pre_request() even for rewritten balancer workers.

* modules/proxy/mod_proxy.h:
  Declare ap_proxy_fixup_uds_filename()

* modules/proxy/mod_proxy.c:
  Fixup UDS filename from r->handler in proxy_handler().

* include/ap_mmn.h:
  Bump MMN minor for ap_proxy_fixup_uds_filename()

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1918626 13f79535-47bb-0310-9956-ffa450edef68