Ruby

• test/rubygems/test_gem_spec_fetcher.rb
  (TestGemSpecFetcher#test_cache_dir_escapes_windows_paths): cache_dir
  may have driveletter and `:' for base of cache_dir itself, so need
  to skip it for checking.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31062 b2dd03c8-39d4-4d8f-98ff-823fe69b080e