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.

* _check_resolved_address() is implemented with getaddrinfo() which is slow
* If available, use socket.inet_pton() instead of socket.getaddrinfo(), because
  it is much faster

Microbenchmark (timeit) on Fedora 21 (Python 3.4, Linux 3.17, glibc 2.20) to
validate the IPV4 address "127.0.0.1" or the IPv6 address "::1":

* getaddrinfo() 10.4 usec per loop
* inet_pton(): 0.285 usec per loop

On glibc older than 2.14, getaddrinfo() always requests the list of all local
IP addresses to the kernel (using a NETLINK socket). getaddrinfo() has other
known issues, it's better to avoid it when it is possible.

Just try to be consistent: _debug was already used in some places, and always
used in BaseProactorEventLoop.

to end up in distutils CFLAGS.

interpreter under test is being run in an environment that requires the use of
environment variables such as PYTHONHOME in order to function at all.

Adds a private test.script_helper._interpreter_requires_environment() function
to be used with @unittest.skipIf on stdlib test methods requiring this.

Patch by Martin Panter.