kill: fails to use only least significant bits to identify signal with -l #7218
Description
Environment: Ubuntu 24.04, uutils main branch (git commit 2430e2a), GNU coreutils v9.6.8-fbfd88-dirty
Steps to reproduce:
# 143 is 15 + 128, and signal number 15 is SIGTERM.
kill -l 143
What happens now: uutils kill displays an error message that the signal 143 is unknown:
kill: unknown signal name '143'
What I expected to happen: GNU kill lists the name of the signal TERM:
TERM
Notes: This is causing a failure in the GNU test file tests/misc/kill.sh. It seems that only some number of the least significant bits are used to identify the signal.