Ruby

ast.c: allocator of Node

• ast.c (Init_ast): undefine allocator of Node, as a method call
  on an uninitialized Node causes segfault.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64168 b2dd03c8-39d4-4d8f-98ff-823fe69b080e