[issue45174] DragonflyBSD fix nis module build

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

The main difference between platforms is that the first argument of the foreach function is int on some platforms and unsigned long on others.

PR 28295 fixes code not only on DragonflyBSD, but on FreeBSD and OpenBSD, where it is unsigned long. It is a bug fix which should be backported. But I afraid that it can break code on macOS. See f6067ec336e2eff1fc1cce90c67c20b0d4e80c22. I am not sure that I understand it completely.

Are there compiler warnings when compile nismodule.c on macOS now? Does nis.cat() work on macOS now? If remove a cast to foreachfunc at line 255, will the compiler complain and how? Will nis.cat() work on macOS with PR 28295 applied?

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components: +macOS
nosy: +brett.cannon, ned.deily, ronaldoussoren, serhiy.storchaka

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<https://bugs.python.org/issue45174>
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