`patterns` may be an array but not the rest argument.

With verbopse mode (-w), the interpreter shows a warning if
a block is passed to a method which does not use the given block.

Warning on:

* the invoked method is written in C
* the invoked method is not `initialize`
* not invoked with `super`
* the first time on the call-site with the invoked method
  (`obj.foo{}` will be warned once if `foo` is same method)

[Feature #15554]

`Primitive.attr! :use_block` is introduced to declare that primitive
functions (written in C) will use passed block.

For minitest, test needs some tweak, so use
https://github.com/minitest/minitest/commit/ea9caafc0754b1d6236a490d59e624b53209734a
for `test-bundled-gems`.

- Rename regexp.rdoc to exclude from "Pages".  This file is for to be
  included in the "class Regexp" document, but it also appeared as a
  separate page duplicately.
- Fix links on case-sensitive filesystems.
- Fix to use rdoc-ref instead of converted HTML page names.

Updated output examples to current format since the output format has changed since version 2.2.0.dev

https://github.com/rubygems/rubygems/commit/48d98f906a