avformat/libsrt: fix deprecated warning

srt_socket was deprecated after 1.4.1.

Reviewed-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Steven Liu <liuqi05@kuaishou.com>

libavformat/libsrt.c

@@ -429,7 +429,11 @@ static int libsrt_setup(URLContext *h, const char *uri, int flags)
 
  restart:
 
+#if SRT_VERSION_VALUE >= 0x010401
+    fd = srt_create_socket();
+#else
     fd = srt_socket(cur_ai->ai_family, cur_ai->ai_socktype, 0);
+#endif
     if (fd < 0) {
         ret = libsrt_neterrno(h);
         goto fail;