Mike Frysinger 4cd7de783b sim: formally assume unistd.h always exists (via gnulib) ...

We have many uses of unistd.h that are unprotected by HAVE_UNISTD_H,
so this is more formalizing the reality that we require this header.
Since we switched to gnulib, it guarantees that a unistd.h exists
for us to include, so we're doubly OK.

2023-01-16 04:35:48 -05:00

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