Fix GuessOS to correctly return "TPF" instead of "OS390" when

compiling apache for TPF.

Submitted by:   Joe Moenich, Ovies Brabson <oviesb@us.ibm.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84310 13f79535-47bb-0310-9956-ffa450edef68