textproc/hs-pandoc: Switch to static build and fix option issues
- With the default options, there were many large dependencies, including ghc. Most users likely just want the application without the compiler and libraries, so switch to a static build.
- The build was failing with a few non-default option combinations (e.g, with HTTPS off). Fix these and/or remove options that are probably not that useful for most users.
- The binary is linked to libffi.so, so add LIB_DEPENDS on devel/libffi.
- Pacify portlint
Reported by: adamw
Approved by: maintainer (haskell via arrowd)
Differential Revision: https://reviews.freebsd.org/D18899