Ruby

Revert r59612

• method.h (rb_method_definition_t): rb_method_type_t should be
  unsigned as it needs 5bits at least for signed extension.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59616 b2dd03c8-39d4-4d8f-98ff-823fe69b080e