waf/python quirk - #646

[Hal Murray]

Our sizeof code is broken on FreeBSD using Python 3.7.7

Works on python 3.6.9, 3.7.6, and 3.8.1

https://gitlab.com/NTPsec/ntpsec/-/issues/646

Does anybody know enough about waf or python to offer some hints?

Lots of tests have worked before we try sizeof.  The sizeof test is slightly 
different in that it prints something out rather than just loads and runs.

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