Don't override a user-supplied value

Link to the active version like other Homebrew deps --
this won't break when another binary-compatible version is installed.
Use a discovery method that doesn't break when other versions are present alongside.

Fix typo `ase` -> `case`

This one gets rid of the extra "usr" subdirectory that we had and now fits the format that pyenv expects

We changed the directory structure for pyston 2.3.1 slightly, where we now
include a top-level "pyston-2.3.1" directory when you unpack the tarball.

Required to prevent a crash when no verbosity given.

* feat(python-build): allow tcl-tk as argument or default to homebrew
* refactor(python-build): detect tcl-tk-libs from confugre_opts_arr

* Disable coreutils on arm64-apple
* Only selectively apply to the affected CPython versions

Co-authored-by: Ivan Pozdeev <vano@mail.mipt.ru>

This is essentially the same fix as in pull request #2047, but it
is applied from Python 2.6.6 to 2.6.9, and for `ossaudiodev` as well
as the (deprecated) `linuxaudiodev`.

With the normal `setup.py`, the installation of the `ossaudiodev`
module is skipped under GNU/Linux with newer kernel versions because
Python 3.1 appends the major kernel version to the result of
`build_ext.get_platform` and later `ossaudiodev` is skipped if the
major kernel version is not 2. A similar problem might occur if
installing in FreeBSD.

This problem may even occur if installing Python 3.1 in a Docker image
of an old OS (e.g. prehistoric Debian or CentOS), because the major
kernel version is still the one of the host system.

The solution is to use `str.startswith` and only check that the
platform starts with 'linux' or 'freebsd'.

It has been recalled due to introducing an unexpected incompatibility:
https://www.python.org/downloads/release/python-393/

The original 2.3 portable version was compiled on Ubuntu 20.04 and didn't work with older glibc.

This has been fixed and the older file has been deleted so hopefully this change is acceptable.