feature: Added support for FreeBSD, NetBSD, OpenBSD and DragonFly. #58

Job	Run time
MSYS2 Build (mingw64, x86_64, 5.4, lua, lua)	46s
MSYS2 Build (mingw64, x86_64, 5.3, lua53, lua5.3)	42s
Build (5.1, windows-latest)	43s
MSYS2 Build (mingw64, x86_64, 5.1, lua51, lua5.1)	46s
Build (5.1, ubuntu-latest)	15s
MSYS2 Build (mingw64, x86_64, 5.1, luajit, luajit)	43s
Build (5.1, macos-latest)	20s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.4, lua, lua)	48s
Build (5.2, windows-latest)	35s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.3, lua53, lua5.3)	47s
Build (5.2, ubuntu-latest)	20s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.1, lua51, lua5.1)	46s
Build (5.2, macos-latest)	15s
Build (5.3, windows-latest)	50s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.1, luajit, luajit)	47s
Build (5.3, ubuntu-latest)	12s
MSYS2 Build (clang64, clang-x86_64, 5.4, lua, lua)	52s
Build (5.3, macos-latest)	16s
MSYS2 Build (clang64, clang-x86_64, 5.3, lua53, lua5.3)	52s
Build (5.4, windows-latest)	24s
MSYS2 Build (clang64, clang-x86_64, 5.1, lua51, lua5.1)	53s
Build (5.4, ubuntu-latest)	10s
MSYS2 Build (clang64, clang-x86_64, 5.1, luajit, luajit)	49s
Build (5.4, macos-latest)	18s
Build (luajit, windows-latest)	23s
Build (luajit, ubuntu-latest)	17s
Upload rockspec	25s
	15m 14s

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