Ruby » Ruby master

• lib/erb.rb: revert r53123. It break compatibility like thor and rspec-rails.
  We should try with Ruby 2.4 or 3.0.
  [Bug #11842][ruby-core:72374]
• lib/rdoc/erb_partial.rb: ditto.
• template/verconf.h.tmpl: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53216 b2dd03c8-39d4-4d8f-98ff-823fe69b080e