Add TPF processing support for the socket read. This allows RFC 1413

support to work properly on TPF.

Submitted by:	David McCreedy <McCreedy@us.ibm.com> and others at IBM


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83861 13f79535-47bb-0310-9956-ffa450edef68