auto merge of #10943 : fhahn/rust/issue-7313-replace-c-types, r=alexcrichton

I've started working on a patch for #7313 . So far I tried to replace C types in `src/libstd/unstable/*` and related files.

So far, I have two questions. Is there a convention for passing pointers around in `std` as Rust types? Sometimes pointers are passed around as `*c_char` (which seems to be an `*i8`), `*c_void` or `*u8`, which leads to a lot of casts. E.g: [`exchange_malloc`](https://github.com/fhahn/rust/compare/issue-7313-replace-c-types?expand=1#diff-39f44b8c3f4496abab854b3425ac1617R60) used to return a `*c_char` but the function in turn only calls `malloc_raw` which returns a `*c_void`.
Is there a specific reason for this?

The second question is about `CString` and related functions like `with_c_str`. At the moment these functions use `*c_char*`. Should I replace it with `*u8` or keep it, because it's an wrapper around classical C strings?

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