OpenBSD has none of those languages in the base OS; given they won't update gcc or switch to clang, Lua is the only one that they could support (NetBSD has it in base) but there is not a lot of system software written in Lua (alas). It doesn't have a depth of libraries that Go does. JavaScript would probably never pass review, so Rust is possibly a future option, unless a system programming community springs up around Lua.