bring back custom-setup stanza

Now that windows is using unix-compat 0.5, don't need a dep on Win32
or unix in custom-setup, so the stanza can be parsed by cabal's limited
parser again.

Note that unix-compat 0.5 is needed on windows, but the cabal file
hasn't bumped it yet, since that would necessarily affect non-windows
builds. Instead, the stack-windows.yaml makes sure the right version is
pulled in.

This commit was sponsored by Jeff Goeke-Smith on Patreon.

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