move unrelated functions declarations out of allformats.h

Originally committed as revision 10475 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -469,6 +469,7 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
     /* XXX: suppress this hack for redirectors */
 #ifdef CONFIG_REDIR_DEMUXER
     if (fmt == &redir_demuxer) {
+        int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f);
         err = redir_open(ic_ptr, pb);
         url_fclose(pb);
         return err;