gentoo linux

[univerz]

to build on gentoo linux i had to make these changes (just hacks without deeper understanding) to mongoc-sys/build.rs

83c83
<     println!("cargo:rustc-link-search=native={}/usr/local/lib", &out_dir.to_string_lossy());
---
>     println!("cargo:rustc-link-search=native={}/usr/local/lib64", &out_dir.to_string_lossy());
86a87,88
>     println!("cargo:rustc-link-lib=zstd");
>     println!("cargo:rustc-link-lib=snappy");