[rust-lang/rust] std::sys::env::environ is causing linking problems on FreeBSD

### ROOT CAUSE The issue arises because `std::sys::env::environ` is defined in the C Runtime (CRT) on FreeBSD, not in libc. When linking with `--no-undefined`, the linker expects all symbols to be resolved, leading to an error when `environ` isn't available in shared libraries. ### CODE FIX To resolve this, replace direct use of `environ` with standard Rust functions that handle environment variables correctly. Here's the fix: ```rust // Replace any direct use of `environ` with `std::env::vars()` for (key, value) in std::env::vars() { // Use key and value as needed } ``` This approach avoids relying on the CRT's `environ` and uses Rust's built-in functionality to safely access environment variables.