codec: libass: show dialog for fontconfig cache recreation on osx

close #12014

(cherry picked from commit fd67a259eadaef3b25dc1ca50b8b09fd971a93fe)
Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>

modules/codec/libass.c

@@ -219,7 +219,7 @@ static int Create( vlc_object_t *p_this )
 #endif
 
 #ifdef HAVE_FONTCONFIG
-#if defined(_WIN32)
+#if defined(_WIN32) || defined(__APPLE__)
     dialog_progress_bar_t *p_dialog =
         dialog_ProgressCreate( p_dec,
                                _("Building font cache"),
@@ -227,7 +227,7 @@ static int Create( vlc_object_t *p_this )
                                   "This should take less than a minute." ), NULL );
 #endif
     ass_set_fonts( p_renderer, psz_font, psz_family, true, NULL, 1 );  // setup default font/family
-#ifdef _WIN32
+#if defined(_WIN32) || defined(__APPLE__)
     if( p_dialog )
     {
         dialog_ProgressSet( p_dialog, NULL, 1.0 );