[issue2443] Define Py_VA_COPY macro as a cross-platform replacement for gcc __va_copy

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Looks like a good idea. Don't other compilers have __va_copy equivalents?
Apparently, C99 defines va_copy(), which we could use conditionally.

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nosy: +pitrou

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