Merge r1341906, r1341913 from trunk:

* acinclude.m4: Use AC_MSG_NOTICE.

* configure.in: Use AC_MSG_NOTICE so passing --silent works as advertised.

Reviewed by: rjung, humbedooh, jorton


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1364675 13f79535-47bb-0310-9956-ffa450edef68