libavformat.v: export ffurl_protocol_next

This is used by avidemux, and is likely usefull to others too.

Patch by: gruntster (Avidemux Rev 7990 — 2012-05-30 13:02:27)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/libavformat.v

@@ -20,6 +20,7 @@ LIBAVFORMAT_$MAJOR {
                 ffurl_seek;
                 ffurl_size;
                 ffurl_write;
+                ffurl_protocol_next;
                 url_open;
                 url_close;
                 url_write;