[issue2897] Deprecate structmember.h

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> Note that structmember.h pollutes global namespace with macros that do not have conventional Py_ or PY_ prefix.  READONLY and RESTRICTED macros seem to be most likely to conflict with other code.

One small enhance would be to add such prefix when Py_LIMITED_API is defined.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue2897>
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