[arch-haskell] dependencies missing in PKGBUILDs

[Adam Vogt]

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.