* doc/extension.rdoc (rb_define_method, rb_define_singleton_method,
  rb_define_private_method, rb_define_protected_method,
  rb_define_module_function, rb_define_global_function): set ANYARGS
  as arguments to their underlying functions.

[ci skip]
Patch by: Dmitry Gritsay <unseductable@gmail.com>
[Fix GH-1473]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57028 b2dd03c8-39d4-4d8f-98ff-823fe69b080e