* 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