[Python-porting] Py_TPFLAGS_HAVE_{WEAKREFS,ITER} in Python 3

[Barry Warsaw]

Someone is trying to build gdb 7.4 with Python 3 and hit a problem with
Py_TPFLAGS_HAVE_ITER.  PEP 234 describes this flag, which no longer exists in
Python 3.  python3porting.com has precious little to say about Py_TPFLAGS
changes in Python 3.

When I did the dbus-python port, I found that Py_TPFLAGS_HAVE_WEAKREFS is both
unnecessary and undefined in Python 3.  Unfortunately, if you're going to
support both Python 2 and 3 with the same C code, you'll need to #ifdef that
away (since it's still required in Python 2).

My guess is that HAVE_ITER falls under the same recommendation, but I'm
looking for verification.  For now, I've added this to
https://wiki.ubuntu.com/Python/3

Cheers,
-Barry
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