Add Rust LuaJIT FFI library #80

Job	Run time
busted (luajit-openresty, ubuntu-latest)	23s
busted (luajit-openresty, windows-latest)	1m 51s
busted (luajit-openresty, macos-latest)	1m 5s
busted (luajit-2.1.0-beta3, ubuntu-latest)	23s
busted (luajit-2.1.0-beta3, windows-latest)	1m 49s
busted (luajit-2.1.0-beta3, macos-latest)	1m 0s
busted (luajit-git, ubuntu-latest)	26s
busted (luajit-git, windows-latest)	2m 1s
busted (luajit-git, macos-latest)	1m 26s
busted (5.4.6, ubuntu-latest)	28s
busted (5.4.6, windows-latest)	2m 6s
busted (5.4.6, macos-latest)	56s
busted (5.1.5, ubuntu-latest)	26s
busted (5.1.5, windows-latest)	1m 25s
busted (5.1.5, macos-latest)	1m 10s
busted (5.3.6, ubuntu-latest)	51s
busted (5.3.6, windows-latest)	1m 40s
busted (5.3.6, macos-latest)	40s
finish	3s
publish	0s
	20m 9s

Provide feedback