merge revision(s) 39721:
* test/ruby/envutil.rb (EnvUtil.with_default_external): add for changing Encoding.default_external without warnings. * test/ruby/envutil.rb (EnvUtil.with_default_internal): ditto. * test/ruby/test_io_m17n.rb: use above with_default_external.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@41364 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 39721:
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@41364 b2dd03c8-39d4-4d8f-98ff-823fe69b080e