lib.systems.inspect.patterns.isGnu: init

This allows checking e.g. stdenv.hostPlatform.isGnu, just like isMusl
or isUClibc.  It was already possible to check for glibc with
stdenv.hostPlatform.libc == "glibc", but when that doesn't line up
with how every other platform check works, this is apparently
sufficiently non-obvious that we've ended up with stuff like adding
glibc.static if !isMusl, which is obviously wrong.

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