bpo-33254: do not return an empty list when asking for the contents of a namespace package (GH-6467)

* issue33377: add triplets for mips-r6 and riscv

* issue33377: add triplets for mips-r6 and riscv (NEWS entry)

long_long() was used with three function types:
PyCFunction, getter and unaryfunction.

Use the _PyTime_t type and round away from zero (ROUND_UP,
_PyTime_ROUND_TIMEOUT) the sleep duration, when converting a Python
object to seconds and then to milliseconds. Raise an OverflowError in
case of overflow.

Previously the (int)double conversion rounded towards zero
(ROUND_DOWN).

In text and entry boxes, this affects selection by double-click,
movement left/right by control-left/right, and deletion left/right
by control-BACKSPACE/DEL.

They where silenced before.

METH_NOARGS functions need only a single argument but they are cast
into a PyCFunction, which takes two arguments.  This triggers an
invalid function cast warning in gcc8 due to the argument mismatch.
Fix this by adding a dummy unused argument.

The wording here seems wrong, as per https://bugs.python.org/msg315792

Cast pointer difference from ssize_t to int: a frame is very unlikely
larger than 2 GB.

Fix test_embed.test_pre_initialization_sys_options() when building with --enable-shared

Previously, the predicate parameter was mentioned, but what it was to be
called with was not documented and required either trial-and-error or
looking into the source to find that it is called with the `value`, or
second item, of the full members list. This change addresses what the
predicate will receive, as well as does some light formatting to make
this clear.

Added tests to ensure that all defined opcodes are supported.

Patch by Neeraj Badlani.

External importers were being added in both phases of the import
system initialisation.

They're only supposed to be added in the second phase, after the
import machinery has been appropriately configured.

* bpo-33251: ConfigParser.items no longer returns items present in vars.

Documentation for `ConfigParser.items()` states:
'Items present in vars no longer appear in the result.'

This fix aligns behaviour to that specified in the documentation.

Starting with glibc 2.27.9000-xxx, sigaddset() can return EINVAL for some
reserved signal numbers between 1 and NSIG.  The `range(1, NSIG)` idiom
is commonly used to select all signals for blocking with `pthread_sigmask`.
So we ignore the sigaddset() return value until we expose sigfillset()
to provide a better idiom.

This change contains minor things that make diffing between Lib/tokenize.py and
Lib/lib2to3/pgen2/tokenize.py cleaner.

Also update PIL doc references to Pillow.

Upgrade ensurepip to bundle pip 10.0.1

Setup modules are no longer built with -DPy_BUILD_CORE by default,
as using that flag may now require including additional internal-only header files.

Instead, only the modules that specifically need it use that setting.