Allow for cgi files without the .EXE extension on them under OS/2.

Submitted by: Garey Smiley, closes PR #59
Reviewed by: Roy Fielding, Chuck Murcko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77706 13f79535-47bb-0310-9956-ffa450edef68