[issue11651] Improve test targets in Makefile

[Antoine Pitrou]

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

I committed the "-j0" part of the patch in d8dd7ab6039d.

Brett made the point on #python-dev that a Makefile change doesn't help Windows users. Instead, we may have a Python script somewhere that both "make test" and "make quicktest" call.

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nosy: +brett.cannon

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