Appears to compile things "out-of-order"

[reem]

Reproduce: https://github.com/reem/railgun/tree/cargo-repro

Cloning the above and running cargo build leads to this output:

    Updating registry `https://github.com/rust-lang/crates.io-index`
   Compiling railgun v0.0.1 (file:///Users/reem/code/rust/x)
   Compiling unsafe-any v0.1.0
   Compiling phantom v0.0.1
   Compiling stainless v0.0.3
   Compiling typeable v0.0.2
   Compiling modifier v0.0.1
   Compiling mime v0.0.1
   Compiling gcc v0.0.2
   Compiling url v0.2.0
   Compiling pkg-config v0.0.1
   Compiling typemap v0.0.3
   Compiling plugin v0.0.0
   Compiling openssl-sys v0.0.2
   Compiling time v0.0.3
   Compiling openssl v0.0.2
   Compiling cookie v0.0.1
   Compiling hyper v0.0.2

railgun appears to be compiled first, even though none of its dependencies are compiled yet.

[alexcrichton]

Closing as a dupe of #833, but see my comment on that issue for why this is happening.