avformat: Add the tls protocol, using OpenSSL or gnutls

Note, this protocol doesn't yet check verify the server
certificate against a local database of trusted CA root
certificates.

Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/allformats.c

@@ -254,5 +254,6 @@ void av_register_all(void)
 #endif
     REGISTER_PROTOCOL (RTP, rtp);
     REGISTER_PROTOCOL (TCP, tcp);
+    REGISTER_PROTOCOL (TLS, tls);
     REGISTER_PROTOCOL (UDP, udp);
 }