Allow running vcpkg on any windows target

cc = "1.0.61"

openssl-src = { version = "111", optional = true }

pkg-config = "0.3.9"

[target.'cfg(target_env = "msvc")'.build-dependencies]

vcpkg = "0.2.8"

# We don't actually use metadeps for annoying reasons but this is still here for tooling

///

/// Note that if this succeeds then the function does not return as vcpkg

/// should emit all of the cargo metadata that we need.

#[cfg(target_env = "msvc")]

fn try_vcpkg() {

    let target = env::var("TARGET").unwrap();

    if !target.contains("windows") {

        return;

    }

    // vcpkg will not emit any metadata if it can not find libraries

    // appropriate for the target triple with the desired linkage.

    process::exit(0);

}

#[cfg(not(target_env = "msvc"))]

fn try_vcpkg() {}

fn execute_command_and_get_output(cmd: &str, args: &[&str]) -> Option<String> {

    let out = Command::new(cmd).args(args).output();

    if let Ok(ref r1) = out {

#[cfg(feature = "vendored")]

extern crate openssl_src;

extern crate pkg_config;

#[cfg(target_env = "msvc")]

extern crate vcpkg;

use std::collections::HashSet;