Bump major version of libavutil due to FIFO fixes.

The current API/ABI should not be considered stable yet, further ABI/API
breakage is possible without major bumps.

Originally committed as revision 17871 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffserver.c

@@ -354,7 +354,7 @@ static void http_av_log(void *ptr, int level, const char *fmt, va_list vargs)
 {
     static int print_prefix = 1;
     AVClass *avc = ptr ? *(AVClass**)ptr : NULL;
-    if (level > av_log_level)
+    if (level > av_log_get_level())
         return;
     if (print_prefix && avc)
         http_log("[%s @ %p]", avc->item_name(ptr), ptr);