chore: checkpoint before Python removal

vendor/getrandom/build.rs

@@ -0,0 +1,11 @@
+//! Build script for memory sanitization support
+
+fn main() {
+    // Automatically detect cfg(sanitize = "memory") even if cfg(sanitize) isn't
+    // supported. Build scripts get cfg() info, even if the cfg is unstable.
+    println!("cargo:rerun-if-changed=build.rs");
+    let sanitizers = std::env::var("CARGO_CFG_SANITIZE").unwrap_or_default();
+    if sanitizers.contains("memory") {
+        println!("cargo:rustc-cfg=getrandom_msan");
+    }
+}