Enable the `zlib` feature of `flate2`
Enable the `zlib` feature of `flate2`

We're already pulling in zlib for other dependencies like curl/libgit2
so there's not really much use in duplicating the compression code with
miniz, so let's instruct `flate2` to use libz as well to compress and
decompress chunks.

vojtechkral/cargo,eminence/cargo,rust-lang/cargo,nipunn1313/cargo,rust-lang/cargo,tsurai/cargo,rustyhorde/cargo,tshepang/cargo,tsurai/cargo,tshepang/cargo,vojtechkral/cargo,eminence/cargo,tsurai/cargo,rust-lang/cargo,nipunn1313/cargo,rustyhorde/cargo,vojtechkral/cargo,tshepang/cargo,eminence/cargo,tshepang/cargo,nipunn1313/cargo,rustyhorde/cargo,tsurai/cargo,tsurai/cargo,nipunn1313/cargo,eminence/cargo,rustyhorde/cargo,rust-lang/cargo,vojtechkral/cargo