fix add_glyphs to use absolute path when extending sys.path

third_party/color_emoji/add_glyphs.py

@@ -1,11 +1,11 @@
 #!/usr/bin/env python
 
-import glob, sys
+import glob, os, sys
 from fontTools import ttx
 from fontTools.ttLib.tables import otTables
 from png import PNG
 
-sys.path.append('../../')
+sys.path.append(os.path.join(os.path.dirname(__file__), '../../'))
 import add_emoji_gsub