PR60947: try to warn affected users...

...but at the moment, this won't actually get logged unless you're
running in debug mode, due to an unrelated bug (PR60999).

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/trunk-openssl-threadid@1791733 13f79535-47bb-0310-9956-ffa450edef68