* dev_urandom() now calls py_getentropy(). Prepare the fallback to support
  getentropy() failure and falls back on reading from /dev/urandom.
* Simplify dev_urandom(). pyurandom() is now responsible to call getentropy()
  or getrandom(). Enhance also dev_urandom() and pyurandom() documentation.
* getrandom() is now preferred over getentropy(). The glibc 2.24 now implements
  getentropy() on Linux using the getrandom() syscall.  But getentropy()
  doesn't support non-blocking mode. Since getrandom() is tried first, it's not
  more needed to explicitly exclude getentropy() on Solaris. Replace:
  "if defined(HAVE_GETENTROPY) && !defined(sun)"
  with "if defined(HAVE_GETENTROPY)"
* Enhance py_getrandom() documentation. py_getentropy() now supports ENOSYS,
  EPERM & EINTR

Issue #28961: Fix unittest.mock._Call helper: don't ignore the name parameter
anymore.

Patch written by Jiajun Huang.

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.