Fix clippy warnings produced by newer Rust

[wiktor-k]

🤔

The ambiguous_glob_reexports now complains about reexport of hostent in openssl-sys/src/lib.rs (as pub use libc::* and pub use openssl::*):

libc::*; | ^^^^^^^ the name `hostent` in the type namespace is first re-exported here

I'll see if I can somehow resolve it cleanly.

[sfackler]

I'm assuming the hostent lints are coming from the bindgen builds. We should probably be excluding that from the codegen and pulling from libc explicitly?

[wiktor-k]

I'm assuming the hostent lints are coming from the bindgen builds. We should probably be excluding that from the codegen and pulling from libc explicitly?

Yep. That was a good lead, thank you!

(For the record local cargo test --features bindgen showed these warnings.)