AFAICT, this is a Win32 platform-specific defect, as there is

no corresponding config.m4, and therefore no unix module named 
mod_lbmethod_rr.

This module was apparently abandoned prior to API changes that
preceeded 2.4.1 and therefore never belonged in the 2.4.x GA.

Remove the last references from branches/2.4.x, and we can deal
later with whether or not this subsists on trunk/...

Reviewed by: wrowe, trawick

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1736269 13f79535-47bb-0310-9956-ffa450edef68