Merge r225753 from trunk:

* modules/ldap/util_ldap_cache.c (util_ldap_cache_init): Use the
actual available size of the shm segment not the requested size.
Ensure the requested size is aligned.  Check errors from apr_rmm_init.

Reviewed by: jorton, minfrin, bnicholes


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@230474 13f79535-47bb-0310-9956-ffa450edef68