This patches static-haskell-nix to work for building postgrest
with updated nixpkgs (from ~202203):
- The ncurses 'enableStatic' argument doesn't exist anymore.
We use the vanilla package instead, which seems to work fine.
- The 'isExecutable' check fails with a strange error related
to trying to override 'mkDerivation'.
We patch 'isExecutable' to check explicitly whether we're building
postgrest. ('isExecutable' is used to determine whether to build
a package statically.)
Robert Vollmert
63ebf6e92b