Debug Mode doesn't expose symbols in the shared / static libraries

[CryZe]

Not quite sure what's happening here, but it's being tracked over here: rust-lang/rust#50007

[CryZe]

This seems to be caused due to debug mode not using LTO. Apparently only the symbols of the main compilation unit get exposed in the shared / static library. I'm not sure if this is intended and if so, how to work around it.

[CryZe]

It seems like rustc is going to gain cargo rustc -- --crate-type ... which would allow us to directly compile the capi crate rather than needing to reexport it.