Incompatible with zig's new build system API

[LordMZTE]

Gyro is currently incompatible with the changes that have recently been made to zig's build system:

/home/lordmzte/dev/dotfiles/scripts/mzteinit/deps.zig:14:17: error: no field or member function named 'addPackage' in 'Build.CompileStep'
        artifact.addPackage(pkgs.@"ansi-term");
        ~~~~~~~~^~~~~~~~~~~