* lib/rubygems:  Update to RubyGems master commit 2a74263.  This fixes
  several bugs in RubyGems 2.2.0.preview.1.

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43298 b2dd03c8-39d4-4d8f-98ff-823fe69b080e