warning message if openssl support is missing while attempting tls connection

(closes issue #16673)
Reported by: michaesc
Patches:
      tls_error_msg.diff uploaded by dvossel (license 671)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@246980 65c4cc65-6c06-0410-ace0-fbb531ad65f3