* lib/rubygems:  Update to RubyGems master bf37240.  Fixes useless
  error message with `gem install -g` with no gem dependencies file.
* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44085 b2dd03c8-39d4-4d8f-98ff-823fe69b080e