Use GHC+Cabal's static/dynamic libdir split
Per discussion in !13 (merged), we should make Qtah use GHC and Cabal's new functionality for separating static and dynamic library directories, because that's the proper way forward, and is needed under certain circumstances, like using Template Haskell with Qtah. For now we're installing
libqtah.so to two places, which is a hack.
The change for this is written on the
dynlibdir branch, but it needs Cabal 126.96.36.199. Debian Stable (stretch) is shipping 188.8.131.52, so we'll wait a bit before adding this change to master.