needed for ssize_t

libiconv expects program_invocation_name to be an lvalue

The sigaction handler called map on an option, creating a pointer to a
move value. This in turned caused UB for signal handlers. Avoid using
pointers directly, and instead prefer references.

I didn't think it'd be this useful first, but thank god for `cargo fix --edition`!

Not sure if I should add a RwLock for the ptrace state too...

It's happening...