Vendor dependencies

Let's see how I like this workflow.

vendor/hermit-abi/Cargo.toml

@@ -0,0 +1,44 @@
+# 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 = "hermit-abi"
+version = "0.1.19"
+authors = ["Stefan Lankes"]
+description = "hermit-abi is small interface to call functions from the unikernel RustyHermit.\nIt is used to build the target `x86_64-unknown-hermit`.\n"
+documentation = "https://hermitcore.github.io/rusty-hermit/hermit_abi"
+readme = "README.md"
+keywords = ["unikernel", "libos"]
+categories = ["os"]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/hermitcore/libhermit-rs"
+[package.metadata.docs.rs]
+default-target = "x86_64-unknown-hermit"
+features = ["docs"]
+[dependencies.compiler_builtins]
+version = "0.1"
+optional = true
+
+[dependencies.core]
+version = "1.0.0"
+optional = true
+package = "rustc-std-workspace-core"
+
+[dependencies.libc]
+version = "0.2.51"
+default-features = false
+
+[features]
+default = []
+docs = []
+rustc-dep-of-std = ["core", "compiler_builtins/rustc-dep-of-std", "libc/rustc-dep-of-std"]