Remove command prototype

[matklad]

A followup of #3177 . I am not sure, but perhaps we can remove/refactor CommandType as well: for each command variant, Compilation as a public dedicated method, but it also has a generic one (process) (haha: https://github.com/rust-lang/cargo/pull/1107/files#r22429844).

[rust-highfive]

r? @alexcrichton

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[alexcrichton]

@bors: r+

Thanks!

[bors]

📌 Commit 5aae6f0 has been approved by alexcrichton

[bors]

⌛ Testing commit 5aae6f0 with merge 4d61a61...

[bors]

💔 Test failed - cargo-win-gnu-64

[alexcrichton]

@bors: retry

On Wed, Oct 12, 2016 at 7:23 AM, bors notifications@github.com wrote:

💔 Test failed - cargo-win-gnu-64
https://buildbot.rust-lang.org/builders/cargo-win-gnu-64/builds/745

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[bors]

⌛ Testing commit 5aae6f0 with merge ee3acca...

[bors]

☀️ Test successful - cargo-cross-linux, cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-gnu-32, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64
Approved by: alexcrichton
Pushing ee3acca to master...