[issue42173] Drop Solaris support

[Marius Pana]

Marius Pana <mp at spearhead.systems> added the comment:

Please do not drop support for SunOS. 
We are happy to provide some hosting services on SmartOS/Illumos for building.

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nosy: +mariuspana

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42173>
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