fix bindgen issue with WASM builds (#433)

Author: samansmink

crates/libduckdb-sys/build.rs

@@ -469,6 +469,7 @@ mod bindings {
             .header(header.clone())
             .allowlist_item(r#"(\w*duckdb\w*)"#)
             .allowlist_type("idx_t")
+            .layout_tests(false) // causes problems on WASM builds
             .clang_arg("-DDUCKDB_EXTENSION_API_VERSION_UNSTABLE")
             .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
             .generate()