Add Brian Havard's os/2 patch for removing

ap_assert() which caused ap_os_canonical_filename() under
os/2 to die with a bad filename


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82830 13f79535-47bb-0310-9956-ffa450edef68