show warning for unused block

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
ea9caafc07
for `test-bundled-gems`.

dir.rb

@@ -408,6 +408,7 @@ class Dir
   #   specifies that patterns may match short names if they exist; Windows only.
   #
   def self.glob(pattern, _flags = 0, flags: _flags, base: nil, sort: true)
+    Primitive.attr! :use_block
     Primitive.dir_s_glob(pattern, flags, base, sort)
   end
 end