* lib/rubygems*: Updated to RubyGems 2.0

* test/rubygems*:  ditto.

* common.mk (prelude):  Updated for RubyGems 2.0 source rearrangement.

* tool/change_maker.rb:  Allow invalid UTF-8 characters in source
  files.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/syck_hack.rb

@@ -46,6 +46,8 @@ module YAML
       end
     end
   end
+
+  SyntaxError = Error unless defined? SyntaxError
 end
 
 # Sometime in the 1.9 dev cycle, the Syck constant was moved from under YAML