This reverts commit ace5c0fd.

If the output buffer provided to wcsxfrm is too small, errno is set to ERANGE. We should not error out in that case.

bpo-20087

bpo-29568: Disable any characters between two percents for escaped percent "%%"  in the format string for classic string formatting. (GH-513)

bpo-26915: Test identity first in membership operation in index() and count() methods of collections.abc.Sequence (GH-503)

Without this option, AppVeyor log is too unreadable.

When LOAD_METHOD is used for calling C mehtod, PyMethodDescrObject
was passed to profilefunc from 5566bbb8.
But lsprof traces only PyCFunctionObject. Additionally, there can be
some third party extension which assumes passed arg is
PyCFunctionObject without calling PyCFunction_Check().

So make PyCFunctionObject from PyMethodDescrObject when
tstate->c_profilefunc is set.

I made changes in almost all CPython files last 5 years, so
mention-bot asks me to review basically all pull requests. I simply
don't have the bandwidth to review everything, sorry! I prefer to
select myself which PR I want to follow.

bpo-29695: Fixed tests after removing keyword args support in some basic type constructors. (GH-520)

int(), bool(), float(), list() and tuple().  Specify the value as a
positional argument instead.

The docs for `heapq.merge` are a little misleading. Iterables passed
into heapq.merge with the reversed flag enabled must be sorted from
largest to smallest to achieve the desired sorting effect, but the
previous paragraph states that they should be sorted from smallest
to largest.

instanciated -> instantiated

Github doesn't support it (ref. isaacs/github#487).  So it can't ease
conflict on Github.

Additionally, it can make trouble when cherry-pick. (ref. GH-212)

* bpo-28087: Skip test_asyncore and test_eintr poll failures on macOS

Skip some tests of select.poll when running on macOS due to unresolved
issues with the underlying system poll function on some macOS versions.

* bpo-27593: Updates Windows build to use information from git

sys.version and the platform module python_build(),
python_branch(), and python_revision() functions now use
git information rather than hg when building from a repo.

Based on original patches by Brett Cannon and Steve Dower.