this module is a hack.

i wanted to control TCP_DEFER_ACCEPT and SO_RCVBUF for the listening
sockets and didn't want to maintain a patch... so i wrote this module
which mucks with the global ap_listeners list.

TCP_DEFER_ACCEPT is a linux socket feature which defers accept() until
there is something to read from the socket.  this is perfect for HTTP
serving because the client has to speak first -- it delays allocating
an apache child until the client has sent at least some of the request.

-dean