[Cin] NetBSD fixes

[Andrew Randrianasulu]

I tried to fix NetBSD build without breaking FreeBSD, Linux and termux..

It seems I successed!

Attached patches builds (and runs)

on NetBSD 9.2 I386
FreeBSD 12.3 amd64
Slackware 15.0 i586
Termux aarch64

all without-thirdparty for saving build time.

Can you test them on your usual systems?
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