#154: Reject setuid multicall invocations where argv[0] doesn't match
AT_EXECFN from the ELF auxiliary vector. Prevents an attacker from
spoofing argv[0] to route the multicall binary to a different tool
in setuid context. Only enforced when euid != uid.
#155: Add daily cargo-audit workflow matching uutils/coreutils pattern.
Also triggers on Cargo.toml/Cargo.lock changes.
Fixes#154. Fixes#155.
Pierre Warnier