Propagate additional cargo build options

[staktrace]

No description provided.

[staktrace]

Mostly I'm interested in --frozen but I figured I'd do the rest as well.

[staktrace]

(Note that the circleci failure happens on the master branch too)

[staktrace]

Updated PR to actually properly propagate the subcommand arguments along to cargo, which it wasn't doing before.

[jrmuizel]

Review ping?

[goddessfreya]

cc @mb64

[mb64]

I tried this out with a simple --color never just to make sure it works, and while it no longer complains about Found argument '--color' which wasn't expected, or isn't valid in this context, the Cargo output was as colorful as ever. It seems that while the arguments are parsed correctly, they aren't getting propagated to the cargo process.