fixing an unlikely crash bug in dict resizing, SF
bug 1456209.

The rest of rev 46589 changes whether Python suppresses
exceptions during some dict-related comparisons.  While I
think that's a good idea, it does change visible behavior at
times, and there was already some complaining about that on
the trunk.  Not a good idea for backporting.  The part of
46589 checked in here can at worst stop segfaults, and I doubt
anyone will gripe about that ;-)

- reset errno before calling confstr - use confstr() doc to simplify
  checks afterwards
- Correct implementation and documentation of os.confstr.  Add a simple
  test case.  I've yet to figure out how to provoke a None return I can test.
- Address issues brought up by MvL on python-checkins.
  I tested this with valgrind on amd64.

  The man pages I found for diff architectures are inconsistent on this.
  I'm not entirely sure this change is correct for all architectures
  either.

  Perhaps we should just over-allocate and not worry about it?

The change to return None instead of "" in case of unconfigured
values has not been backported.

the need for the out-of-tree universal binary support that was used to build
the 2.4.3 installer.

Missing here relative to that tree are some changes to IDLE, IMHO those patches
aren't appropriate for the 2.4 branch and users are better of using 2.5's IDLE.

Bug #1572832: fix a bug in ISO-2022 codecs which may cause segfault
when encoding non-BMP unicode characters.  (Submitted by Ray Chason)

Fix segfault when doing string formatting on subclasses of long if
__oct__, __hex__ don't return a string.

Klocwork 308