Based on report and initial patch from Germán M. Bravo

Patch by Vlad Shcherbina

Patch contributed by Vajrasky Kok. Addresses Issue #17324

if all necessary functions are already found in libuuid.
Patch by Evgeny Sologubov.

Addresses issue #14927

Patch contributed by Anoop Thomas Mathew.

Addresses issue #18800

Addresses issue #18438

When test.support was converted to a package, it started silently
skipping the tests which needed to download support data to run.

This change refactors the affected code, and also tidies up
test.support.findfile to remove the unused *here* parameter, document
the *subdir* parameter and rename the *filename* parameter to avoid
shadowing the file builtin and be consistent with the documentation.

The unexpected skips were noticed and reported by Zachary Ware

Patch contributed by Olivier Hervieu and Dmi Baranov.

Fixes issue #18206 Patch contributed by  Berker Peksag and py.user

Correct the wrong documentation.

The error caused test_inline_methods() to test much less than intended.
Caught (& fixed) by Armin Rigo.

existing directory caused mkstemp and related APIs to fail instead of
retrying. Report and fix by Vlad Shcherbina.

_PyDebugAllocatorStats() called PyOS_snprintf() with a %zd format
code, but MS doesn't support that code.  Interpolated
PY_FORMAT_SIZE_T in place of the "z".

the _sre moduel.

when input list contains duplicates.

Issue #18709: GCC 4.6 complains that 'v' may be used uninitialized in GEN_EMAIL/GEN_URI/GEN_DNS case

64-bit pointer to long (32 bits).

Issue #18876: The FileIO.mode attribute now better reflects the actual mode under which the file was opened.
Patch by Erik Bray.

This commit fixes a regression that sneaked into Python 3.3 where importlib
was not respecting -E when checking for the PYTHONCASEOK environment variable.

This simplifies and clarifies the code, and gives a small speedup.

Contributed by Jeroen Van Goey