bpo-41039: Simplify python3.dll build (GH-20989)

Use linker comment #pragma and preprocessor for re-exporting stable API functions and variables. Module definition file, custom build targets and entry point code become unnecessary and can be removed. This change also fixes missing _PyErr_BadInternalCall export on x86.
python · Jun 23, 2020 · 2c6e4e9 · 2c6e4e9
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diff --git a/Misc/NEWS.d/next/Windows/2020-06-23-03-12-57.bpo-41039.0hgd0s.rst b/Misc/NEWS.d/next/Windows/2020-06-23-03-12-57.bpo-41039.0hgd0s.rst
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+Stable ABI redirection DLL (python3.dll) now uses ``#pragma
+comment(linker)`` for re-exporting.