vm_method.c: remove unused code
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51090 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm_method.c: remove unused code
prohibit method re-definition, introduced at r34983.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51090 b2dd03c8-39d4-4d8f-98ff-823fe69b080e