Vendor dependencies

Let's see how I like this workflow.

vendor/errno-dragonfly/Cargo.toml

@@ -0,0 +1,27 @@
+# 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"