Since Cabal 2.2 conditional blocks support the `elif` construct [0], but our hackage importer does not currently support such expressions. This causes importing packages like `raaz` [1] to fail.
0: https://cabal.readthedocs.io/en/latest/cabal-package.html?highlight=elif#conditional-blocks 1: https://hackage.haskell.org/package/raaz
