SHMCB should not have been using apr_rmm -- it was doing so incorrectly,

for one thing.  But it just plain doesn't need it.  Rip it out to avoid
segfaulting.

Submitted by:  Aaron Bannert


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94876 13f79535-47bb-0310-9956-ffa450edef68