pythongh-108337: Add pyatomic.h header

This adds a new header that provides atomic operations on common data types. The intention is that this will be exposed through Python.h, although that is not the case yet. The only immediate use is in the test file.
vstinner · Aug 31, 2023 · d8dc286 · d8dc286
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diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
@@ -833,6 +833,9 @@ Build Changes
   :ref:`debug build <debug-build>`.
   (Contributed by Victor Stinner in :gh:`108634`.)
 
+* Building CPython now requires a compiler with support for the C11 atomic
+  library, GCC built-in atomic functions, or MSVC interlocked intrinsics.
+
 
 C API Changes
 =============