adds FreeBSD OS, and potentially other BSD OSes#476

Merged

s3rvac merged 8 commits intoavast:masterfrom gwquk:master

Jan 31, 2019

+87-7

Commits on Jan 28, 2019

adds FreeBSD OS, and potentially other BSD OSes
Charlie Root
committed
cmake: Improve the heading of utils.cmake.
gwquk
committed
suggested changes
gwquk
committed