config: Bump POSIX spec references to IEEE Std 1003.1-2008, 2016 Edition #858
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These references had been using IEEE Std 1003.1, 2004 Edition, but:
Shifting to 2016 also syncs us with the
file
reference. The initial reasoning for the 2004 edition is unclear to me (more on that in 70858bc).The change-log for the
exec
page doesn't list any relevant changes, and skimming a diff of the two HTML pages didn't turn up anything significant.Diffing the two HTML pages for environment variables also turned up no significant changes. Both definition reference the Portable Character Set for uppercase letters, digits, and underscore, but the
U####
values for those have not changed.