feature: Added support for FreeBSD, NetBSD, OpenBSD and DragonFly. #55

Job	Run time
MSYS2 Build (mingw64, x86_64, 5.4, lua, lua)	46s
Build (5.1, windows-latest)	29s
MSYS2 Build (mingw64, x86_64, 5.3, lua53, lua5.3)	43s
Build (5.1, ubuntu-latest)	10s
MSYS2 Build (mingw64, x86_64, 5.1, lua51, lua5.1)	45s
Build (5.1, macos-latest)	18s
MSYS2 Build (mingw64, x86_64, 5.1, luajit, luajit)	44s
Build (5.2, windows-latest)	34s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.4, lua, lua)	43s
Build (5.2, ubuntu-latest)	20s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.3, lua53, lua5.3)	50s
Build (5.2, macos-latest)	19s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.1, lua51, lua5.1)	48s
Build (5.3, windows-latest)	33s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.1, luajit, luajit)	46s
Build (5.3, ubuntu-latest)	24s
MSYS2 Build (clang64, clang-x86_64, 5.4, lua, lua)	50s
Build (5.3, macos-latest)	15s
MSYS2 Build (clang64, clang-x86_64, 5.3, lua53, lua5.3)	55s
Build (5.4, windows-latest)	32s
MSYS2 Build (clang64, clang-x86_64, 5.1, lua51, lua5.1)	54s
Build (5.4, ubuntu-latest)	20s
MSYS2 Build (clang64, clang-x86_64, 5.1, luajit, luajit)	53s
Build (5.4, macos-latest)	16s
Build (luajit, windows-latest)	49s
Build (luajit, ubuntu-latest)	32s
Upload rockspec	0s
	15m 28s

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