bpo-34956: Fix macOS _tkinter use of Tcl/Tk in /Library/Frameworks by ned-deily · Pull Request #20171 · python/cpython

…ythonGH-20171)

_tkinter now builds and links with non-system Tcl and Tk frameworks if they
are installed in /Library/Frameworks as had been the case on older releases
of macOS. If a macOS SDK is explicitly configured, by using ./configure
--enable-universalsdk= or -isysroot, only a Library/Frameworks directory in
the SDK itself is searched. The default behavior can still be overridden with
configure --with-tcltk-includes and --with-tcltk-libs.

This set of patches includes the following upstream pull requests,
in this order:

- PR 20171, "Fix _tkinter use"
  python/cpython#20171
  (prerequisite for patch #21249 to apply)

- PR 21114, "Support `arm64` in Mac/Tools/pythonw"
  python/cpython#21114

- PR 21224, "allow python to build for macosx-11.0-arm64"
  python/cpython#21224

- PR 21249, "ctypes fixes for arm64 Mac OS"
  python/cpython#21249

The patches for 20171 and 21249 have been minimally modified in order
to backport them to 3.8.3.

Note that these have been successfully tested for `python@3.8`
but not for `python@3.7`.

The patch directive should be surrounded by an `if Hardware::CPU.arm?`
block.