avio: deprecate url_open_buf

It's only used in one place and does the same thing as
avio_alloc_context.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

ffserver.c

@@ -2721,7 +2721,8 @@ static int http_receive_data(HTTPContext *c)
             if (!fmt_in)
                 goto fail;
 
-            url_open_buf(&pb, c->buffer, c->buffer_end - c->buffer, URL_RDONLY);
+            pb = avio_alloc_context(c->buffer, c->buffer_end - c->buffer,
+                                    0, NULL, NULL, NULL, NULL);
             pb->is_streamed = 1;
 
             if (av_open_input_stream(&s, pb, c->stream->feed_filename, fmt_in, NULL) < 0) {

libavformat/avio.h

@@ -629,9 +629,9 @@ URLContext *url_fileno(AVIOContext *s);
  * @deprecated use AVIOContext.max_packet_size directly.
  */
 attribute_deprecated int url_fget_max_packet_size(AVIOContext *s);
-#endif
 
-int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags);
+attribute_deprecated int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags);
+#endif
 
 /** return the written or read size */
 int url_close_buf(AVIOContext *s);

libavformat/aviobuf.c

@@ -996,6 +996,7 @@ int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
  * back to the server even if CONFIG_MUXERS is false. */
 #if CONFIG_MUXERS || CONFIG_NETWORK
 /* buffer handling */
+#if FF_API_OLD_AVIO
 int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
 {
     int ret;
@@ -1009,6 +1010,7 @@ int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
         av_freep(s);
     return ret;
 }
+#endif
 
 int url_close_buf(AVIOContext *s)
 {