* common.mk: download emoji-data.txt.  As emoji data files are
  located in a separate directory in Unicode.org site, reearranged
  Unicode data files directories same as the site.

* tool/enc-unicode.rb (get_file): search emoji data files in the
  second argument path.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60977 b2dd03c8-39d4-4d8f-98ff-823fe69b080e