Add clone(2) implementation
Add clone(2) implementation

This implementation kindly provided by @LemonBoy at GitHub
https://github.com/ziglang/zig/pull/6187#issuecomment-682635168

zig-lang/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig