stream_lavf: use smb:// for ffmpeg libsmbclient support

If you really want that, you can get it through FFmpeg, I guess.

DOCS/man/mpv.rst

@@ -898,7 +898,7 @@ PROTOCOLS
 
 ``smb://PATH``
 
-    Play a path from  Samba share.
+    Play a path from  Samba share. (Requires FFmpeg support.)
 
 ``bd://[title][/device]`` ``--bluray-device=PATH``
 

stream/stream_lavf.c

@@ -428,7 +428,7 @@ const stream_info_t stream_info_ffmpeg_unsafe = {
   .open = open_f,
   .protocols = (const char *const[]){
      "lavf", "ffmpeg", "udp", "ftp", "tcp", "tls", "unix", "sftp", "md5",
-     "concat",
+     "concat", "smb",
      NULL },
   .stream_origin = STREAM_ORIGIN_UNSAFE,
   .can_write = true,