digest.so needs ruby/digest.h which is installed by build-ext

	Copy to path with the base name

Set to "--with-" options, not "--without-" keys.

The extconf.rb in mysql2 gem repeats `dir_config('mysql')`, without
and with the default path.  The third call returns the former results
even with the default path.  Since it does not check the results of
the third call, that `nil` is passed to `find_library` as a path, and
fails with `NoMethodError`.

cmd.exe can redirect file descriptor other than STDOUT, while
command.com couldn't.

This commit is to add an extra option to enable verbose mode (V=1) in the
generated `Makefile` at runtime of the Ruby to print compiler command lines by
the commands below when building native extensions. It's possible to enable the
verbose mode by setting the environment variable `MAKEFLAGS="V=1"`[1]
implemented in GNU make. However, I wanted to make a consistent user-interface
not depending on the specific make's implementation.

```
$ ruby /path/to/extconf.rb -- --with-verbose
```

You can also add the extra option via rake-compiler gem.

```
$ rake compiler -- --with-verbose
```

If the extra option is not given, the value of the
`RbConfig::CONFIG["MKMF_VERBOSE"]` enabled by the configure option below is
used.

```
$ ./configure --enable-mkmf-verbose
```

For the unit tests, updated the following files.

* The `test/mkmf/test_configuration.rb` was created to test the cases with the
  `configuration` method and this implementation.
* Updated the `TestMkmf#assert_separately` to set the extra
  arguments in `test/mkmf/base.rb`. Updated tests using the `assert_separately`.
* Added tests for `MakeMakefile#with_config` in the `test/mkmf/test_config.rb`.

[1] https://www.gnu.org/software/make/manual/html_node/Variables_002fRecursion.html

Fixes [Bug #19695]

Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>