feature: Added support for FreeBSD, NetBSD, OpenBSD and DragonFly. #54

Job	Run time
Build (5.1, windows-latest)	31s
MSYS2 Build (mingw64, x86_64, 5.4, lua, lua)	41s
Build (5.1, ubuntu-latest)	14s
MSYS2 Build (mingw64, x86_64, 5.3, lua53, lua5.3)	44s
Build (5.1, macos-latest)	17s
MSYS2 Build (mingw64, x86_64, 5.1, lua51, lua5.1)	47s
Build (5.2, windows-latest)	39s
MSYS2 Build (mingw64, x86_64, 5.1, luajit, luajit)	46s
Build (5.2, ubuntu-latest)	14s
Build (5.2, macos-latest)	17s
Build (5.3, windows-latest)	47s
Build (5.3, ubuntu-latest)	10s
Build (5.3, macos-latest)	23s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.4, lua, lua)	45s
Build (5.4, windows-latest)	46s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.3, lua53, lua5.3)	46s
Build (5.4, ubuntu-latest)	10s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.1, lua51, lua5.1)	45s
Build (5.4, macos-latest)	14s
MSYS2 Build (ucrt64, ucrt-x86_64, 5.1, luajit, luajit)	47s
Build (luajit, windows-latest)	45s
MSYS2 Build (clang64, clang-x86_64, 5.4, lua, lua)	53s
Build (luajit, ubuntu-latest)	25s
MSYS2 Build (clang64, clang-x86_64, 5.3, lua53, lua5.3)	52s
MSYS2 Build (clang64, clang-x86_64, 5.1, lua51, lua5.1)	57s
MSYS2 Build (clang64, clang-x86_64, 5.1, luajit, luajit)	54s
Upload rockspec	0s
	15m 29s

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