Patch by Vajrasky Kok.

Patch by Martin Panter.

and email.test.

Patch by David Edelsohn.

Patch by Martin Panter.

Issue #23445: pydebug builds now use "gcc -Og" where possible, to make the resulting executable faster.

Fix undefined behaviour: don't compare pointers. Use Py_uintptr_t type instead
of void*. It fixes test_faulthandler on Fedora 22 which now uses GCC 5.

already finished

Fixes a regression in issue #22765.  Patch by Vinson Lee.

Patch by Eldar Abusalimov.

(currently only used for builds with <= 10.5 deployment targets)

on Windows

values (like 0.9.8zc).

pass -I or -E to the child process by default when the environment is required
for the child process interpreter to function properly.