Combine some common code. Before this, all platforms implemented their

own iol_sockets using APR.  This just combines all of that code to a
common file and moves that file to main.  I have tested this with all of
the Unix MPM's, but I am willing to bet I missed something (Makefiles) for
Windows, and possibly moving some code for OS/2 and BeOS.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85732 13f79535-47bb-0310-9956-ffa450edef68