Add a compatibility define for escape_uri() -> ap_escape_uri() to ap_compat.h

Submitted by: David White <david@persimmon.com>
Reviewed by: Ralf S. Engelschall
PR: 3725


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82722 13f79535-47bb-0310-9956-ffa450edef68