Update openssl/src/lib.rs

//! * `OPENSSL_STATIC` - If set, the crate will statically link to OpenSSL rather than dynamically link.

//! * `OPENSSL_LIBS` - If set, a `:`-separated list of library names to link to (e.g. `ssl:crypto`). This can be used

//!     if nonstandard library names were used for whatever reason.

//! * `OPENSSL_NO_VENDOR` - If present, always find openssl in the system, even if the `vendored` feature is set by

//!     the crate that's using this one.

//! * `OPENSSL_NO_VENDOR` - If set, always find OpenSSL in the system, even if the `vendored` feature is enabled.

//!

//! Additionally, these variables can be prefixed with the upper-cased target architecture (e.g.

//!     `X86_64_UNKNOWN_LINUX_GNU_OPENSSL_DIR`), which can be useful when cross compiling.