PR:

Obtained from:
Submitted by:	Jim Jagielski
Reviewed by:
Best of both worlds... Let the world know if we have mmap and/or
shmget as well as controlling which to use for scoreboard. This
should be a complete patch, so if any docs were skipped, feel free
to update 'em


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@79969 13f79535-47bb-0310-9956-ffa450edef68