* lib/rubygems.rb:  Bump version to 2.0.1 for upcoming bugfix release

* lib/rubygems/ext/ext_conf_builder.rb:  Restore ruby 1.8 compatibility
  for [Bug #9698]
* test/rubygems/test_gem_installer.rb:  Ditto.

* lib/rubygems/package.rb:  Restore ruby 1.8 compatibility.

* test/rubygems/test_gem_dependency_installer.rb:  Fix warnings


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39597 b2dd03c8-39d4-4d8f-98ff-823fe69b080e