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.

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).

Noticed by Serhiy Storchaka.

Patch by Jim Fasarakis-Hilliard.