The contents of this attribute are an implementation detail, as
documented for #9442, so we should not parse it, to support non-CPython
VMs in the future.

Unfortunately, one use comes directly from PEP 345, so an edit will have
to be agreed before fixing the code (see comment in d2.markers).

Other remaining uses are found in d2.compiler and could be replaced by
the platform module (which also parses sys.version, but then it wouldn?t
be my fault :)

For some reason, the diff for distutils/_backport/misc.py makes it seem
like it?s a new file instead of showing the changes I did during the
merge.

This moves individual backported functions from compat into a new
_backport.misc module.  compat regains its original purpose of
containing 2to3 support code (i.e. compat for projects using distutils2,
not internal compat for d2 code) and all backports now live under the
private _backport subnamespace.

Also fix the definition of ?any? to bind it to the builtin in 2.5+
(fsencode and detect_encoding not changed, they never exist in
2.x).

This codebase is compatible with 3.1, 3.2 and 3.3.  It was converted with 2to3
and a semi-automated diff/merge with packaging in 3.3 to fix some idioms.
We?ve now come full circle from 2.x to 3.x to 2.x to 3.x again :)

Starting from now, contributors can make patches for packaging (preferred, as
the stdlib?s regrtest is very useful), distutils2 or distutils-python3, and
we?ll make patches flow between versions.