legba fails to build with OpenSSL 4.0

[loqs]

Versions:

• legba HEAD c82104a
• OpenSSL 4.0.0

Steps to reproduce:

$ git clone https://github.com/evilsocket/legba.git
$ cd legba
$ OPENSSL_NO_VENDOR=true cargo build
....
  --- stderr

  thread 'main' (5826) panicked at /build/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/openssl-sys-0.9.109/build/main.rs:492:5:


  This crate is only compatible with OpenSSL (version 1.0.1 through 1.1.1, or 3), or LibreSSL 2.5
  through 4.1.x, but a different version of OpenSSL was found. The build is now aborting
  due to this version mismatch.


  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

• legba-openssl-4.0-build-failure.log
• openssl-sys 0.9.114
• openssl 0.10.78

@kpcyrd @pierres