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

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.

* 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>

Ensuring that all dirs in LDFLAGS exist is only needed for Ruby due to its `configure` requirements.
If some LDFLAGS entries point to a nonexisting path to which the user doesn't have permission. this causes a build failure.

The $(type -p | head -1) construct expects to always get a path, so need to ignore such aliases with -P

Closes https://github.com/pyenv/pyenv/issues/1662

E.g. "*-latest"
May need splitting into project-specific ones if there emerge projects with different check needed

Closes https://github.com/pyenv/pyenv/issues/1559

In certain cases, a user wants to know the cached filename to add the file themselves,
see https://github.com/pyenv/pyenv/issues/1743 .
Since we report both a filename and a URL anyway, there's no reason to report a wrong one.

This behavior is only triggered when the version is provided as an empty string,
is undocumented and breaks if multiple local versions are specified
(rightly so since it's unclear which of them to install).

The bootstrap.pypa.io URLs for pip installation changed.

Added aarch64 for Linux in anaconda_architecture()

Added aarch64 for Linux in anaconda_architecture()

fixes #1805

Fix pyenv to continue to support legacy Python builds despite the fact that `get-pip` has dropped support for Python 2 as discussed in pypa/get-pip#87

* Update python-build with arm64 architecture

Add LDFLAGS for Xcode SDK zlib on macOS >= 1100 to resolve build issues on Big Sur.

* Remove Ruby references from python-build

* restore fix_directory_permissions

This PR fixes (currently harmless) warning on macOS when homebrew is *not* installed.

- [ ] Test case (required?)

For example:

```sh
wadkar$ pyenv install 3.8.2
/Users/wadkar/.pyenv/plugins/python-build/bin/python-build: line 1541: brew: command not found
/Users/wadkar/.pyenv/plugins/python-build/bin/python-build: line 1541: brew: command not found
Installing openssl-1.1.0j...
Installed openssl-1.1.0j to /Users/wadkar/.pyenv/versions/3.8.2

Installing readline-8.0...
Installed readline-8.0 to /Users/wadkar/.pyenv/versions/3.8.2

Installing Python-3.8.2...
python-build: use zlib from xcode sdk
Installed Python-3.8.2 to /Users/wadkar/.pyenv/versions/3.8.2
```