Vendor dependencies

Let's see how I like this workflow.

vendor/errno-dragonfly/.cargo-checksum.json

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+{"files":{"Cargo.toml":"36cf2ca7d85e09d22a7dd384f95c51eb6a7f1a6234d3c54d251dfa575b990430","LICENSE":"e5b1e4fcd8ea2b20b09f378e44ef3f51f4b6a72a72b9f6a729e0f87bddcef97f","README.md":"1e8440a65b6befd65a507b60fb11ab29f314dd77012aa7a11b5d1fadbb5f908f","build.rs":"10d4f05ac56556fea0e98732dc4250ddf3f1acc3fea541c63a0bc130aca772e6","src/errno.c":"a857e47b114acb85fddcb252a610ab5734d225c26b7bedd7c35d7789d46c8526","src/lib.rs":"47245dcfc2d5797584444e70edb1997b2f5e39ecc0779599a7fcded379966c0f"},"package":"aa68f1b12764fab894d2755d2518754e71b4fd80ecfb822714a1206c2aab39bf"}

vendor/errno-dragonfly/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 believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+edition = "2018"
+name = "errno-dragonfly"
+version = "0.1.2"
+authors = ["Michael Neumann <mneumann@ntecs.de>"]
+include = ["Cargo.toml", "LICENSE", "README.md", "build.rs", "src/lib.rs", "src/errno.c"]
+description = "Exposes errno functionality to stable Rust on DragonFlyBSD"
+keywords = ["dragonfly"]
+license = "MIT"
+repository = "https://github.com/mneumann/errno-dragonfly-rs"
+[dependencies.libc]
+version = "0.2"
+default-features = false
+[build-dependencies.cc]
+version = "1.0"

vendor/errno-dragonfly/LICENSE

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+MIT License
+
+Copyright (c) 2017 Michael Neumann
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/errno-dragonfly/README.md

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+# errno-dragonfly-rs
+
+Exposing `errno` functionality to stable Rust on DragonFly BSD.

vendor/errno-dragonfly/build.rs

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+fn main() {
+    cc::Build::new().file("src/errno.c").compile("liberrno.a");
+}

vendor/errno-dragonfly/src/errno.c

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+#include <errno.h>
+
+int *errno_location() { return &errno; }

vendor/errno-dragonfly/src/lib.rs

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+#![no_std]
+
+#[link(name = "errno", kind = "static")]
+extern "C" {
+    pub fn errno_location() -> *mut libc::c_int;
+}