[Feature request] Option to skip package building for build-only dependencies

[skysmurf]

Portmaster currently has an option "-g" that instructs it to build packages. However, in its current state it's all or nothing: either build packages for everything or don't build any packages. I would very much like to see an option that excludes build-only dependencies from having packages built for them. (In other words: "build packages for the port and its run-time dependencies, but not for its build-only dependencies".)