Vendor dependencies

Let's see how I like this workflow.

vendor/windows_i686_gnu/.cargo-checksum.json

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+{"files":{"Cargo.toml":"405b1cdc0c055002dc87524f5d3b73890236ea55b90da3c1e55f554bbe3bc5d0","build.rs":"000703af30e0803750ab7d9a087728f109f058144368e8f53532ddcae317ab73","lib/libwindows.a":"afe361a5834d46dfdd5d263cf244c1e2f6007e03314164375cb3ce909802ea52","src/lib.rs":"bdf6c7cf1fc01f69cc1d4e52948d1f246fdd310e6323d5dd1efd23f1daf382ef"},"package":"fbeae19f6716841636c28d695375df17562ca208b2b7d0dc47635a50ae6c5de7"}

vendor/windows_i686_gnu/Cargo.toml

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+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "windows_i686_gnu"
+version = "0.42.0"
+authors = ["Microsoft"]
+description = "Code gen support for the windows crate"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/microsoft/windows-rs"
+
+[package.metadata.docs.rs]
+default-target = "x86_64-pc-windows-msvc"
+targets = []

vendor/windows_i686_gnu/build.rs

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+fn main() {
+    let target = std::env::var("TARGET").unwrap();
+    if target != "i686-pc-windows-gnu" && target != "i686-uwp-windows-gnu" {
+        return;
+    }
+
+    let dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    println!("cargo:rustc-link-search=native={}", std::path::Path::new(&dir).join("lib").display());
+}

vendor/windows_i686_gnu/src/lib.rs

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+#![no_std]