Can't build PyImath_d on Windows without debug Python build

On Windows pyconfig.h automatically links to debug Python builds if _DEBUG is defined:
https://github.com/python/cpython/blob/v3.10.9/PC/pyconfig.h#L270-L271

Boost Python wraps this so that it can be compiled in debug mode without requiring a debug build of Python:
https://github.com/boostorg/python/blob/boost-1.76.0/include/boost/python/detail/wrap_python.hpp#L23-L48

This is the default behaviour and can be controlled using BOOST_DEBUG_PYTHON.

Because PyImath headers include Python.h directly this bypasses the Boost python wrapper causing link incompatibility.

These headers should include `boost/python/detail/wrap_python.hpp` instead. Other libraries (e.g. USD) wrap BOOST_DEBUG_PYTHON in a cmake option, e.g.: https://github.com/PixarAnimationStudios/USD/pull/1478

Start by locating the PyImath headers that include Python.h and compare their includes with Boost.Python's wrap_python.hpp. Replace the direct Python header usage as described, then verify that PyImath builds and links on Windows without requiring a debug Python build.

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