Vendor dependencies

Let's see how I like this workflow.

vendor/getrandom/Cargo.toml

@@ -0,0 +1,83 @@
+# 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 = "getrandom"
+version = "0.2.8"
+authors = ["The Rand Project Developers"]
+exclude = [".*"]
+description = "A small cross-platform library for retrieving random data from system source"
+documentation = "https://docs.rs/getrandom"
+readme = "README.md"
+categories = [
+    "os",
+    "no-std",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-random/getrandom"
+
+[package.metadata.docs.rs]
+features = [
+    "std",
+    "custom",
+]
+rustdoc-args = [
+    "--cfg",
+    "docsrs",
+]
+
+[dependencies.cfg-if]
+version = "1"
+
+[dependencies.compiler_builtins]
+version = "0.1"
+optional = true
+
+[dependencies.core]
+version = "1.0"
+optional = true
+package = "rustc-std-workspace-core"
+
+[features]
+custom = []
+js = [
+    "wasm-bindgen",
+    "js-sys",
+]
+rdrand = []
+rustc-dep-of-std = [
+    "compiler_builtins",
+    "core",
+    "libc/rustc-dep-of-std",
+    "wasi/rustc-dep-of-std",
+]
+std = []
+test-in-browser = []
+
+[target."cfg(all(target_arch = \"wasm32\", target_os = \"unknown\"))".dependencies.js-sys]
+version = "0.3"
+optional = true
+
+[target."cfg(all(target_arch = \"wasm32\", target_os = \"unknown\"))".dependencies.wasm-bindgen]
+version = "0.2.62"
+optional = true
+default-features = false
+
+[target."cfg(all(target_arch = \"wasm32\", target_os = \"unknown\"))".dev-dependencies.wasm-bindgen-test]
+version = "0.3.18"
+
+[target."cfg(target_os = \"wasi\")".dependencies.wasi]
+version = "0.11"
+
+[target."cfg(unix)".dependencies.libc]
+version = "0.2.120"
+default-features = false