bug#48548: 28.0.50; Some process attributes on macOS are missing

[Lars Ingebrigtsen]

Filipp Gunbin <fgunbin@fastmail.fm> writes:

>   Improve system_process_attributes on macOS (Bug#48548)

Looks good to me, but I've added Alan to the CCs -- perhaps he'll have
some comments.

Just one small comment:

> -  size_t proclen = sizeof proc;
> +  size_t len = sizeof proc;

Any reason for this change?

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