build: allow dead code in the fork

Author: BrycensRanch

build.rs

@@ -45,6 +45,7 @@ fn main() {
             .arg("https://github.com/jmbryan4/uniffi-bindgen-cs")
             .arg("--branch")
             .arg("upgrade/uniffi-rs-0.31.0-clean")
+            .env("RUSTFLAGS", "-A dead_code")
             .stdout(Stdio::inherit())
             .stderr(Stdio::inherit())
             .status()