Add Rust LuaJIT FFI library #79

Job	Run time
busted (luajit-openresty, ubuntu-latest)	24s
busted (luajit-openresty, windows-latest)	1m 41s
busted (luajit-openresty, macos-latest)	52s
busted (luajit-2.1.0-beta3, ubuntu-latest)	23s
busted (luajit-2.1.0-beta3, windows-latest)	2m 2s
busted (luajit-2.1.0-beta3, macos-latest)	51s
busted (luajit-git, ubuntu-latest)	24s
busted (luajit-git, windows-latest)	1m 42s
busted (luajit-git, macos-latest)	59s
busted (5.4.6, ubuntu-latest)	26s
busted (5.4.6, windows-latest)	1m 15s
busted (5.4.6, macos-latest)	59s
busted (5.1.5, ubuntu-latest)	23s
busted (5.1.5, windows-latest)	1m 41s
busted (5.1.5, macos-latest)	52s
busted (5.3.6, ubuntu-latest)	25s
busted (5.3.6, windows-latest)	1m 45s
busted (5.3.6, macos-latest)	45s
finish	6s
publish	0s
	17m 55s

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