* Remove all use of `greadlink`, fix #2654

Signed-off-by: Harry Chen <i@harrychen.xyz>

* revert greadlink back in tests

---------

Signed-off-by: Harry Chen <i@harrychen.xyz>
Co-authored-by: Anton Petrov <anton.a.petrov@gmail.com>

* Cleanup mocks logic
* Add test for `:latest`

Without rpath, python would link up to the system's libpython

Surprisingly, CPython doesn't search these with pkg-config
This is fixed upstream in 3.12.0a1

To match other Pyenv commands

To take advantage of the existing logic to add to rpath

Likely in Ubuntu where it's only available as a snap

It was moved to `pyenv-install`

CPython 3.11+ dropped support for --with-tcl-tk-*
in favor of pure pkgconfig

Since 3.12, CPython can provide debug symbols in
Apple's nonstandard way, "dSYM bundles"

Support frozen builtin modules e.g. upip

* Fix: patterns for pypy2.*/pypy3.* versions

* Shrink pypy patterns

* Fix extglob pattern

* Fix: no regex-charclasses like '[:digit:]' in 'extglob', needs also double-activation for parse/runtime stage

Co-authored-by: native-api <vano@mail.mipt.ru>
Co-authored-by: Bjoern Schneider <bjoern.schneider@scribos.com>

Co-authored-by: native-api <vano@mail.mipt.ru>

Tkinter check is conditional on DISPLAY

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

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

In Linux, it's not the primary source of packages and
cannot be used without build flag adjustments
thus has caused build failures.

Trace logs without `-v` are usually useless due to missing the build part.
So this leaves one less thing for users to worry about
when submitting error reports.

Mentioning `-v` in the issue template should stay for some time
since users report on old versions, too.

This reverts commit 90d0d20508.

After further consideration, we've decided to remove this workaround:
* It only has an effect if the user has added `gnubin` from Homebrew Coreutils to PATH which is an unsupported setup
* It was intended to be applied only to a few select 3.8 and 3.9 versions that officially support Apple Silicon and only fail with Homebrew Coreutils in PATH because they have `config.*` from a too old version of Autoconf that doesn't support the Arm64 arch -- but
  * CPython devs [didn't actually fix the problem in 3.10, either, only in 3.11](https://github.com/pyenv/pyenv/pull/2157#issuecomment-968055387), so we'd need to apply it to all 3.10 releases, too
  * users started pushing this workaround into other unrelated branches because they were using the above unsupported setup. See https://github.com/pyenv/pyenv/pull/2190#pullrequestreview-835221952 for discussion.

This is needed to find other Python deps (e.g. libintl) in Homebrew if it has
nonstandard prefix (e.g. in Apple M1)

* Re-allow to search Homebrew for zlib everywhere

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.

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