Do not scan for subtitles files in the current dir for TS files

This should work around #3547.
(manually cherry picked from c6ab39323aacc0d62f0908a3f526e93261de62e2)

src/input/subtitles.c

@@ -303,6 +303,16 @@ char **subtitles_Detect( input_thread_t *p_this, char *psz_path,
 
     i_fname_len = strlen( f_fname );
 
+    /* HACK: do not look for subtitles for Transport Streams */
+    /* This breaks the clock synchronization */
+    if( i_fname_len > 3 && !strcasecmp( f_fname + i_fname_len - 3, ".ts" ) )
+    {
+        free( f_fname );
+        free( f_dir );
+        free( psz_fname );
+        return NULL;
+    }
+
     f_fname_noext = malloc(i_fname_len + 1);
     f_fname_trim = malloc(i_fname_len + 1 );
     if( !f_fname_noext || !f_fname_trim )