cargo rustc -- --crate-type cdylib stopped working

[lu-zero]

Right now on stable cargo rustc -- --crate-type cdylib correctly produces the cdylib.
Nightly fails since cargo tries to pass the dependencies as .rmeta instead of .rlib.

[alexcrichton]

This is due to pipelining support being added to Cargo, but this was never really intended to work and/or going to work. Crate type output is so intrusive that Cargo needs to know about it, so cargo rustc can't be used to update the crate types via the CLI (which Cargo doesn't parse, it just forwards to rustc)