[config] Add HB_NO_EMOJI

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

src/hb-config.hh

@@ -58,6 +58,7 @@
 #define HB_NO_BITMAP
 #define HB_NO_CFF
 #define HB_NO_COLOR
+#define HB_NO_EMOJI
 #define HB_NO_FACE_COLLECT_UNICODES
 #define HB_NO_GETENV
 #define HB_NO_HINTING

src/hb-ot-shape.cc

@@ -479,6 +479,7 @@ hb_set_unicode_props (hb_buffer_t *buffer)
     {
 	_hb_glyph_info_set_continuation (&info[i]);
     }
+#ifndef HB_NO_EMOJI
     else if (unlikely (_hb_glyph_info_is_zwj (&info[i])))
     {
       _hb_glyph_info_set_continuation (&info[i]);
@@ -490,6 +491,7 @@ hb_set_unicode_props (hb_buffer_t *buffer)
 	_hb_glyph_info_set_continuation (&info[i]);
       }
     }
+#endif
     /* Or part of the Other_Grapheme_Extend that is not marks.
      * As of Unicode 11 that is just:
      *

src/hb-unicode.cc

@@ -570,6 +570,7 @@ _hb_modified_combining_class[256] =
 /*
  * Emoji
  */
+#ifndef HB_NO_EMOJI
 
 #include "hb-unicode-emoji-table.hh"
 
@@ -581,3 +582,4 @@ _hb_unicode_is_emoji_Extended_Pictographic (hb_codepoint_t cp)
 		     sizeof (hb_unicode_range_t),
 		     hb_unicode_range_t::cmp);
 }
+#endif