[issue22096] Argument Clinic: add ability to specify an existing impl function

[Zachary Ware]

New submission from Zachary Ware:

It would be nice to be able to specify an existing function as the _impl function, for cases like winreg.OpenKey and OpenKeyEx which are the same function by different names, or _winapi.GetCurrentProcess, whose impl function is "return GetCurrentProcess()".

This is pretty minor, but would allow for some shorter and cleaner code.  Unfortunately, I don't have any great ideas for syntax for this, so it may be rejected just on that basis.

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priority: normal -> low

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22096>
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