Add HB_NO_OT_FONT_CFF

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

src/hb-ot-font.cc

@@ -183,10 +183,12 @@ hb_ot_get_glyph_extents (hb_font_t *font,
   bool ret = ot_face->sbix->get_extents (font, glyph, extents);
   if (!ret)
     ret = ot_face->glyf->get_extents (glyph, extents);
+#if !defined(HB_NO_OT_FONT_CFF)
   if (!ret)
     ret = ot_face->cff1->get_extents (glyph, extents);
   if (!ret)
     ret = ot_face->cff2->get_extents (font, glyph, extents);
+#endif
   if (!ret)
     ret = ot_face->CBDT->get_extents (font, glyph, extents);
   // TODO Hook up side-bearings variations.