demux_lavf: disable extension_picky for hls demuxer globally

Added in FFmpeg/FFmpeg@91d96dc

The user can still turn this on via demuxer-lavf-o=extension_picky=1 if
they want to.

This causes quite a few problems with many HLS sources where the codecs
are not known at probe time for whatever reason. Youtube for instance
shows "aac" audio codecs as "unknown".

As an aside, the FFmpeg test is also buggy and leaks a nested
connection for any playlist item that fails the extension check. mpv
catches this and prints "Leaking 1 nested connections (FFmpeg bug)" for
every HLS stream that has at least one stream that fails the extension
check.

demux/demux_lavf.c

@@ -147,6 +147,7 @@ struct format_hack {
     bool no_seek_on_no_duration : 1;
     bool readall_on_no_streamseek : 1;
     bool first_frame_only : 1;
+    bool no_ext_picky : 1;      // set "extension_picky" to false
 };
 
 #define BLACKLIST(fmt) {fmt, .ignore = true}
@@ -162,7 +163,7 @@ static const struct format_hack format_hacks[] = {
     {"mp3", "audio/mpeg", 24, 0.5},
     {"mp3", NULL,         24, .max_probe = true},
 
-    {"hls", .no_stream = true, .clear_filepos = true},
+    {"hls", .no_stream = true, .clear_filepos = true, .no_ext_picky = true},
     {"dash", .no_stream = true, .clear_filepos = true},
     {"sdp", .clear_filepos = true, .is_network = true, .no_seek = true},
     {"mpeg", .use_stream_ids = true},
@@ -1005,6 +1006,9 @@ static int demux_open_lavf(demuxer_t *demuxer, enum demux_check check)
                    "analyzeduration to %f\n", analyze_duration);
     }
 
+    if (priv->format_hack.no_ext_picky)
+        av_dict_set_int(&dopts, "extension_picky", 0, 0);
+
     if ((priv->avif_flags & AVFMT_NOFILE) || priv->format_hack.no_stream) {
         mp_setup_av_network_options(&dopts, priv->avif->name,
                                     demuxer->global, demuxer->log);