Corrections to mistakes that I made in the course of merging everything from threading that wasn't already in httpd24 into this httpd24threading branch. I hope I have it correct now, but it wasn't an easy merge and there may still be mistakes. These all came to light in the course of building the new branch. More may come to light when I actually get it running.

git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/branches/httpd24threading@1538005 13f79535-47bb-0310-9956-ffa450edef68