[NPTH] npth and fork

[NIIBE Yutaka]

On 11/28/2016 11:54 PM, Werner Koch wrote:
> So that the next time someone with a very old AIX versions files a bug
> report, we can reject this as wontfix after only looking at the code
> with the call to sem_init.

I added comments and pushed the change.  I also add detection of Grand
Central Dispatch for macOS only.

Interestingly, the t-fork test successes on macOS Sierra (I had expected
a failure).
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