[python-win32] Dropping support for Python 2.3?

[Tim Golden]

[re supporting 2.3 for adodbapi]

Ditch it, I say. I think the minimum I test against for any of my stuff
is 2.4 -- and I'm more and more inclined towards 2.6+. As you say,
there's a small but definite overhead, the more so as we support 2.x and
3.x from the same codebase.

(I have to do some fancy footwork in one test to avoid even importing a
test support module under 3.x which is needed for 2.x).

TJG