Misc/NEWS.d/next/C API/2020-02-12-21-24-02.bpo-35081.at7BjN.rst


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Move the ``dtoa.h`` header file to the internal C API as ``pycore_dtoa.h``:
it only contains private functions (prefixed by ``_Py``). The :mod:`math` and
:mod:`cmath` modules must now be compiled with the ``Py_BUILD_CORE`` macro
defined.