This reverts commit 7cf3d8e2.

Due to regressions found with using Tk 8.6.9.1, build the python.org macOS installers with Tcl/Tk 8.6.8 as used in previous releases.



https://bugs.python.org/issue35402

https://bugs.python.org/issue35596

bpo-35585: Speed up enum by-value lookup

https://bugs.python.org/issue35579


https://bugs.python.org/issue35579

Depending on system config, a missing candidate compiler name may be
reported as the empty string rather than as None, so adjust the test
helper accordingly.

AIX allows a trailing slash on local file system paths, which isn't what we want
in http.server. Accordingly, check explicitly for this case in the server code,
rather than relying on the OS raising an exception.

Patch by Michael Felt.

This test case needs "signed short" bitfields, but the
IBM XLC compiler (on AIX) does not support this.

Skip the code and test when AIX and XLC are used.

Use __xlc__ as identifier to detect the XLC compiler.

* use platform.system() as runtime test, rather than sys.platform() build-time test
* IPv6 zone id support on AIX is limited to inet_pton6_zone(), so skip related
  getaddrinfo() and getnameinfo() tests as not supported

* Revert part of "bpo-35565:  Remove incorrect test and one that wasn't needed for the fix.

Fix also handling non-ascii default values.

defines utility function -> defines utility functions

Reported in https://mail.python.org/pipermail/docs/2018-December/038693.html

The Code Context menu item only works on Editor windows so disable it for others.

`BLDSHARED` needs to have both `LDFLAGS` and `LDFLAGS_NODIST`, not just `LDFLAGS_NODIST`; `PY_CORE_LDFLAGS` provides both.  For example, as it stands now with just `LDFLAGS_NODIST`, macOS universal builds are broken as the necessary `-arch` flags are no longer passed to the standard library extension module link step from `setup.py` resulting in extension modules being single architecture only.


https://bugs.python.org/issue35257

There is no need to create a list for `sum`
Also, becomes consistent with the first example in Doc/library/os.rst

"Include/token.h", "Lib/token.py" (containing now some data moved from
"Lib/tokenize.py") and new files "Parser/token.c" (containing the code
moved from "Parser/tokenizer.c") and "Doc/library/token-list.inc" (included
in "Doc/library/token.rst") are now generated from "Grammar/Tokens" by
"Tools/scripts/generate_token.py". The script overwrites files only if
needed and can be used on the read-only sources tree.

"Lib/symbol.py" is now generated by "Tools/scripts/generate_symbol_py.py"
instead of been executable itself.

Added new make targets "regen-token" and "regen-symbol" which are now
dependencies of "regen-all".

The documentation contains now strings for operators and punctuation tokens.

The Code Context menu label now toggles between Show/Hide Code Context. 
 The Zoom Height menu now toggles between Zoom/Restore Height. 
 Zoom Height has moved from the Window menu to the Options menu. 

 
https://bugs.python.org/issue22703

This addresses C extension build errors related to an undefined _hypot
symbol when building with the Microsoft Visual C++ Compiler for Python
2.7 [1] or MinGWPy [2]. It also addresses errors when building a C++
extension with MinGWPy and C++11 from cmath, 'error "::hypot' has not
been declared'

[1] https://www.microsoft.com/en-us/download/details.aspx?id=44266
[2] https://mingwpy.github.io/

Fix typo in the docstring of `service_actions`.
serve_forver -> serve_forever

multiprocessing.Pool destructor now emits ResourceWarning
if the pool is still running.