vendored build of openssl on Ubuntu for windows failed.

Building OS : Ubuntu

```
[dependencies]
openssl = { version = "0.10.25", features = ["vendored"] }
```

Cross Compliation Tool : https://github.com/rust-embedded/cross
```
cross +beta build --target x86_64-pc-windows-gnu --release
```

```
x86_64-w64-mingw32-ar: creating apps/libapps.a
x86_64-w64-mingw32-ar: creating libssl.a
x86_64-w64-mingw32-ar: creating libcrypto.a
thread 'main' panicked at 'OpenSSL libdir at `/home/jerry/rocket-proxy/target/x86_64-pc-windows-gnu/release/build/openssl-sys-3f4f15680432076c/out/openssl-build/install/lib` does not contain the required files to either statically or dynamically link OpenSSL', /home/jerry/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-sys-0.9.52/build/main.rs:303:13
```