`protoc` binary downloaded and stored inside the crate.
Can be used to avoid downloading and installing `protoc` binary.
```rust
protoc_bin_vendored::protoc_bin_path().unwrap()
```
returns a path to a `protoc` binary packaged into the crate.
Crate also packs `.proto` files distributed with protobuf:
```rust
protoc_bin_vendored::include_path().unwrap()
```