revert r64817: kernel_warn.rb: skip kernel_require.rb
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64822 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
revert r64817: kernel_warn.rb: skip kernel_require.rb
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64822 b2dd03c8-39d4-4d8f-98ff-823fe69b080e