new ports: devel/flang and devel/flang-clang.
Welcome the freshly released flang Fortran LLVM compiler (currently only for amd6) ! It needs as a companion a custom clang, added as flang-clang.
Reviewed by: swills (mentor)
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D10805