Merge r721796 from trunk:

* Enable the use of autoconf >= 2.62 without causing APR / APR-UTIL options
  passed to the configure script issue warnings about unknown options.

Submitted by: rpluem
Reviewed by: rpluem, pquerna, tdonovan


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@722216 13f79535-47bb-0310-9956-ffa450edef68