[otlayout] Remove two unused HB_OT_LAYOUT_GLYPH_PROPS_* values

src/hb-ot-layout-gdef-table.hh

@@ -391,7 +391,6 @@ struct GDEF
     default:			return 0;
     case BaseGlyph:		return HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH;
     case LigatureGlyph:		return HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE;
-    case ComponentGlyph:	return HB_OT_LAYOUT_GLYPH_PROPS_COMPONENT;
     case MarkGlyph:
 	  klass = get_mark_attachment_type (glyph);
 	  return HB_OT_LAYOUT_GLYPH_PROPS_MARK | (klass << 8);

src/hb-ot-layout-gsub-table.hh

@@ -292,7 +292,8 @@ struct Sequence
     if (unlikely (!substitute.len)) return TRACE_RETURN (false);
 
     unsigned int klass = c->buffer->cur().glyph_props() &
-			 HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE ? HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH : 0;
+			 HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE ?
+			 HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH : 0;
     unsigned int count = substitute.len;
     if (count == 1) /* Special-case to make it in-place. */
     {

src/hb-ot-layout-private.hh

@@ -121,10 +121,13 @@ _hb_glyph_info_flip_joiners (hb_glyph_info_t *info)
  */
 
 typedef enum {
+  /* One bit available here...          = 0x01u */
+
+  /* The following three match LookupFlags::Ignore* numbers. */
   HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH	= 0x02u,
   HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE	= 0x04u,
-  HB_OT_LAYOUT_GLYPH_PROPS_MARK		= 0x08u,
-  HB_OT_LAYOUT_GLYPH_PROPS_COMPONENT	= 0x10u, /* Unused; can be removed. */
+  HB_OT_LAYOUT_GLYPH_PROPS_MARK		= 0x08u
+
 } hb_ot_layout_glyph_class_mask_t;