avio: deprecate url_fgets

It's not used anywhere and doesn't look ver useful to be public.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

libavformat/avio.h

@@ -514,9 +514,11 @@ int url_fprintf(AVIOContext *s, const char *fmt, ...) __attribute__ ((__format__
 int url_fprintf(AVIOContext *s, const char *fmt, ...);
 #endif
 
+#if FF_API_OLD_AVIO
 /** @note unlike fgets, the EOL character is not returned and a whole
     line is parsed. return NULL if first char read was EOF */
-char *url_fgets(AVIOContext *s, char *buf, int buf_size);
+attribute_deprecated char *url_fgets(AVIOContext *s, char *buf, int buf_size);
+#endif
 
 void put_flush_packet(AVIOContext *s);
 

libavformat/aviobuf.c

@@ -915,6 +915,7 @@ int url_fprintf(AVIOContext *s, const char *fmt, ...)
 }
 #endif //CONFIG_MUXERS
 
+#if FF_API_OLD_AVIO
 char *url_fgets(AVIOContext *s, char *buf, int buf_size)
 {
     int c;
@@ -935,6 +936,7 @@ char *url_fgets(AVIOContext *s, char *buf, int buf_size)
         *q = '\0';
     return buf;
 }
+#endif
 
 int url_fget_max_packet_size(AVIOContext *s)
 {