* lib/rubygems:  Update to RubyGems master af60443.  Changes include:

  * Improved speed of `gem install --ignore-dependencies`.

  * Open read-write for exclusive flock.  [ruby-trunk - Bug #9257]

  * Remove specification before install to prevent infinite loop.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44286 b2dd03c8-39d4-4d8f-98ff-823fe69b080e