chore: checkpoint before Python removal

vendor/wit-bindgen/build.rs

@@ -0,0 +1,32 @@
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap_or(String::new());
+    let target_family = env::var("CARGO_CFG_TARGET_FAMILY").unwrap_or(String::new());
+    let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+
+    if target_family != "wasm" {
+        return;
+    }
+
+    if target_arch != "wasm32" {
+        panic!("only wasm32 supports cabi-realloc right now");
+    }
+
+    let mut src = env::current_dir().unwrap();
+    src.push("src");
+    src.push("rt");
+    src.push("libwit_bindgen_cabi.a");
+
+    let dst_name = format!(
+        "wit_bindgen_cabi{}",
+        env!("CARGO_PKG_VERSION").replace(".", "_")
+    );
+    let dst = out_dir.join(format!("lib{dst_name}.a"));
+
+    std::fs::copy(&src, &dst).unwrap();
+
+    println!("cargo:rustc-link-lib=static={dst_name}");
+    println!("cargo:rustc-link-search=native={}", out_dir.display());
+}