* lib/rubygems/*: upgrade to RubyGems 2.2.3. [Backport #10515]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@49074 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-12-30

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@49075 b2dd03c8-39d4-4d8f-98ff-823fe69b080e