Prepare the fallback to support getentropy() failure and falls back on reading
from /dev/urandom.

Issue #29174, #26741: subprocess.Popen.__del__() now keeps a strong reference
to warnings.warn() function.

Fix backward compatibility issue, HAVE_LONG_LONG was defined but empty, whereas
it is defined as 1 in Python 3.5.

Fix error in format string.

test_powlong is the same as test_powint.
Patch by Lukas Schwaighofer.

test_powlong is the same as test_powint.
Patch by Lukas Schwaighofer.

test_powlong is the same as test_powint.
Patch by Lukas Schwaighofer.

The default value of fold is zero, not True. Fix the docstring of the Python
implementation.

Fix time_hash() function: replace DATE_xxx() macros with TIME_xxx() macros.
Before, the hash function used a wrong value for microseconds if fold is set
(equal to 1).

Issue #28839: Optimize _PyFunction_FastCallDict() when kwargs is an empty
dictionary, avoid the creation of an useless empty tuple.

function_call() now simply calls _PyFunction_FastCallDict().

_PyFunction_FastCallDict() is more efficient: it contains fast paths for the
common case (optimized code object and no keyword argument).

Noticed by Serhiy Storchaka.

regrtest: simplify the regex used to match test names for the --fromfile
command line option.

Patch by Jim Fasarakis-Hilliard.