Darwin violates POSIX by making
`dup2(x,x)`, which should be a no-op, error. Consequently, we must take
care not to `dup2` in such cases.
We had already made this change in the `posix_spawnp` codepath but I had
assumed that this *only* affected `posix_spawnp`, not the `dup2` system
call itself.

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Bump to nightly-2022-07-30
Remove redundant import in Stack.Package
Bump to nightly-2022-08-02 (GHC 9.2.4)
Fix 4101-dependency-tree test
Maybe fix the ghc-install-hooks test
process-1.6.15.0 now available
Includes fix haskell/process#250

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