Don't install hlint in build images
HLint has rather inconvenient build dependencies which don't necessarily build with the bootstrap compiler used for GHC builds. For instance, currently it inexplicably fails to build with 9.0.1 on ARMv7.
HLint has rather inconvenient build dependencies which don't necessarily build with the bootstrap compiler used for GHC builds. For instance, currently it inexplicably fails to build with 9.0.1 on ARMv7.