Clean the worker MPM a bit. This removes the idea of compiling worker

with no threads.  That doesn't make any sense anyway.  Also, raise
HARD_SERVER_LIMIT to 16, from 8.

Submitted by:	"Ian Holsman" <ianh@cnet.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91137 13f79535-47bb-0310-9956-ffa450edef68