lang/ghc: Fix dependencies on gmp and ffi and avoid misconfiguration
devel/hs-hastache: 0.4.2 --> 0.5.0
devel/hs-hoogle: 4.2.14 --> 4.2.15
devel/hs-shake: 0.6 --> 0.8
math/hs-semigroupoids: 3.0.1 --> 3.0.2