avformat/hlsenc: set strict_std_compliance from the parent AVFormatContext

fix ticket: 8388
Reviewed-by: Jan Ekström <jeebjp@gmail.com>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

libavformat/hlsenc.c

@@ -782,6 +782,7 @@ static int hls_mux_init(AVFormatContext *s, VariantStream *vs)
     oc->opaque                   = s->opaque;
     oc->io_open                  = s->io_open;
     oc->io_close                 = s->io_close;
+    oc->strict_std_compliance    = s->strict_std_compliance;
     av_dict_copy(&oc->metadata, s->metadata, 0);
 
     if (vs->vtt_oformat) {