[util] Also hide ppem settings in hb-ot-shape-closure

Leaving ptem, as that can in theory change shape closure if we apply it
to optical-size axis (we currently don't).

util/options.cc

@@ -573,12 +573,15 @@ font_options_t::add_options (option_parser_t *parser)
     parser->free_later (font_size_text);
   }
 
+  unsigned font_size_flags = DEFAULT_FONT_SIZE == FONT_SIZE_NONE ? G_OPTION_FLAG_HIDDEN : 0;
   GOptionEntry entries[] =
   {
-    {"font-size",	0, DEFAULT_FONT_SIZE ? 0 : G_OPTION_FLAG_HIDDEN,
+    {"font-size",	0, font_size_flags,
 			      G_OPTION_ARG_CALLBACK,	(gpointer) &parse_font_size,	font_size_text,					"1/2 integers or 'upem'"},
-    {"font-ppem",	0, 0, G_OPTION_ARG_CALLBACK,	(gpointer) &parse_font_ppem,	"Set x,y pixels per EM (default: 0; disabled)",	"1/2 integers"},
-    {"font-ptem",	0, 0, G_OPTION_ARG_DOUBLE,	&this->ptem,			"Set font point-size (default: 0; disabled)",	"point-size"},
+    {"font-ppem",	0, font_size_flags,
+			      G_OPTION_ARG_CALLBACK,	(gpointer) &parse_font_ppem,	"Set x,y pixels per EM (default: 0; disabled)",	"1/2 integers"},
+    {"font-ptem",	0, 0,
+			      G_OPTION_ARG_DOUBLE,	&this->ptem,			"Set font point-size (default: 0; disabled)",	"point-size"},
     {"font-funcs",	0, 0, G_OPTION_ARG_STRING,	&this->font_funcs,		text,						"impl"},
     {"ft-load-flags",	0, 0, G_OPTION_ARG_INT,		&this->ft_load_flags,		"Set FreeType load-flags (default: 2)",		"integer"},
     {nullptr}