* lib/rubygems/config_file.rb:  Ignore permissions check on windows.
	  Windows writes 0600 file as 0644 permissions making the check
	  useless.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39070 b2dd03c8-39d4-4d8f-98ff-823fe69b080e