The ports using c2hs and gtk2hs fail to build with modern compilers as the c11 features of the FreeBSD system headers are not hidden, yet the tools only understand c99.
- revert change to devel/hs-ncurses from r436451
- patch devel/hs-c2hs to pass -std=c99.
- patch devel/hs-gtk2-buildtools to pass -std=c99.
This should fix compilation of