Rollup merge of #87236 - sunfishcode:avoid-locking-args, r=joshtriplett

Simplify command-line argument initialization on unix

Simplify Rust's command-line argument initialization code on unix:
 - The cleanup code isn't needed, because it was just zeroing out non-owning variables at runtime cleanup time. After 91c3eee1735ad72b579f99cbb6919c3471747d94, Rust's command-line initialization code on unix no longer allocates `CString`s and a `Vec` at startup time.
 - The `Mutex` isn't needed; if there's somehow a call to `args()` before argument initialization has happened, the code returns return an empty list, which we can do with a null check.

With these changes, a simple cdylib that doesn't use threads avoids getting `pthread_mutex_lock`/`pthread_mutex_unlock` in its symbol table.

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