Revert r1821526, r1821527, r1821534, r1821538, r1821539, r1821541, r1821605, r1821607, r1821608.

Instead of copying event/fdqueue.c code into existing mpm_unix.c, losing all
contributors (blame, since r89781 ...), will restart the series by svn-moving
event/fdqueue.[ch] to server/mpm_fdqueue.[ch] first.

The code is not really unix specific either, so this sounds better.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1821619 13f79535-47bb-0310-9956-ffa450edef68