* lib/rubygems: Update to RubyGems 2.2.0.preview.1

This brings several new features to RubyGems summarized here:

  https://github.com/rubygems/rubygems/blob/v2.2.0.preview.1/History.txt

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42967 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/package.rb

@@ -349,11 +349,20 @@ EOM
 
         FileUtils.rm_rf destination
 
-        FileUtils.mkdir_p File.dirname destination
+        mkdir_options = {}
+        mkdir_options[:mode] = entry.header.mode if entry.directory?
+        mkdir =
+          if entry.directory? then
+            destination
+          else
+            File.dirname destination
+          end
+
+        FileUtils.mkdir_p mkdir, mkdir_options
 
         open destination, 'wb', entry.header.mode do |out|
           out.write entry.read
-        end
+        end if entry.file?
 
         say destination if Gem.configuration.really_verbose
       end