[merge] Remove setgid test on AtomicFile

[John Arbash Meinel]

When I wrote tests for Atomic File, I added a test that we can make the
target file have mode 02666, which sets the setgid bit.

It isn't something we actually need, and it fails on Mac. (What we
really want is to be able to create *directories* with setgid at certain
times, we don't care about files).

The attached patch just removes the bogus test.

John
=:->
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