The OS/2 handling of process group was broken by a porting patch for MPE

(rev 1.116), so I restored the prior code for OS/2 and cleaned up the
compiler conditionals.

Submitted by: Roy Fielding and Garey Smiley


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78165 13f79535-47bb-0310-9956-ffa450edef68