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OK - here is a new ambitious patch ;)  It attempts to
rationalize all platforms, not just the PC.

* pyport.h now sets up most of the import/export magic.  It
looks for Py_ENABLE_SHARED and Py_BUILD_CORE (both new
macros) that control the behaviour.

* Py_ENABLE_SHARED has been added to pyconfig.h.in and
configure.in, so that this macro is created in pyconfig.h
whenever '--enable-shared' is passed to configure. 
Py_BUILD_CORE is passed via a "/D" option only when the core
itself is built (ie, not extensions etc)

* PC/pyconfig.h has been rationalized heavily.

* A couple of places in the core have been changed to use
the new macros - more to test that it actually works.

This has been tested on Windows using MSVC, Windows using
cygwin/gcc, and RH7 linux.  I consider it basically "done"
so please comment away.