Vendor dependencies

Let's see how I like this workflow.

vendor/windows_x86_64_gnullvm/.cargo-checksum.json

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+{"files":{"Cargo.toml":"00d46711214b33e76f5ea92d7207b8a36f3fcde57d3ee0be42d95e304b4c5821","build.rs":"f909646de7a03d6998bf644e9aea2b732c3f0705e24b296f78ff323d4bf74137","lib/libwindows.a":"f39df4f03f66297b8a436d8fcd4c7c80048b8d25d211bbeb18656d2fdb027d50","src/lib.rs":"bdf6c7cf1fc01f69cc1d4e52948d1f246fdd310e6323d5dd1efd23f1daf382ef"},"package":"09d525d2ba30eeb3297665bd434a54297e4170c7f1a44cad4ef58095b4cd2028"}

vendor/windows_x86_64_gnullvm/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_x86_64_gnullvm"
+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_x86_64_gnullvm/build.rs

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+fn main() {
+    let target = std::env::var("TARGET").unwrap();
+    if target != "x86_64-pc-windows-gnullvm" {
+        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_x86_64_gnullvm/src/lib.rs

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+#![no_std]