[arch-haskell] dependencies missing in PKGBUILDs

cabal2arch should add dependencies that appear in the register script (maybe versioned depends too), but are only makedepends: example: haskell-blas has no dependencies, but the register script fails needing ieee-0.2. That information des not appear in the cabal file, but maybe it exists somewhere other than the register scripts. Lots of packages are missing dependencies like this: using the haskell-overlay now requires that you check ghc-pkg's output for missing dependencies.