Implement ap_os_case_canonical_filename() for OS/2. Fixes SCRIPT_NAME

CGI var if PATH_INFO has upper case value & possibly other things too.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84739 13f79535-47bb-0310-9956-ffa450edef68