Needed to link against libpython of the Pyenv-controlled installation

Headers have been moved to the 'tcl-tk' subdir
This was causing Tcl/Tk 8.5 from XCode SDK to be silently picked instead

XCode Command Line Tools 15.0 was recently released, and it contains a
broken version of ncurses 6.0. Some uses of Python's `curses` module
will segfault when compiled with it. The solution is to switch to using
the version of ncurses from Homebrew, which is currently 6.4. Support
for ncurses 6 was added to Python 3.7 and was backported to 3.6 and 2.7,
so this change should not break any recently supported Python versions.

Tested with Python 3.12, 3.11, and 2.7, and all tests in
the `test.test_curses` module pass without issue.

See https://github.com/python/cpython/issues/109617 and
https://github.com/python/cpython/issues/69906 for more information.

All include directories should go into CPPFLAGS.
XCode SDK was being added to CFLAGS instead
which caused old Tcl/Tk in the SDK to override a newer one in Homebrew.

The -s flag assures that nothing can be installed to user site-packages
but doesn't keep ensurepip from looking there for Pip.
If Pip is installed in the user site-packages directory, pip won't be installed
for the newly built python -- and its shim won't be created.
-I makes the build install Pip in any case.
The user site-packages installation will override it --
but we'll have the shim at least.

Guthub have recently preinstalled x64 Homebrew OpenSSL to stock MacOS runners. This has caused FreeBSD OpenSSL detection logic to erroneously trigger when running FreeBSD tests in MacOS because their paths happened to coincide.

Replaced checking a specific path with checking with pkg.

* 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>