This commit removes Cargo's dependency on `winapi` 0.2 which takes an
excessively long time to build, slowing down Windows builds. The
`winapi` 0.2 crate was pulled in via a dependency chain that looked
like:
cargo
\- crates-io
\- http
\- bytes
\- iovec
\- winapi 0.2
The fix implemented here was to remove the `http` crate dependency from
`crates-io` which is only used for rendering status codes, but it's easy
enough to inline that function locally.
