Port mod_mmap_static to 2.0. Make it go faster.

core: Export core_translate() as ap_core_translate() for use by
      mod_mmap_static.
Submitted by:	Greg Ames
Reviewed by:	Jeff Trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85437 13f79535-47bb-0310-9956-ffa450edef68