timeout(1): Add -f and -p options as per POSIX.1-2024
POSIX.1-2024 first defined the timeout(1) utility and specified the '-f'
and '-p' options, which are the short versions of '--foreground' and
'--preserve-status' options, respectively. Add the short versions to
comply with the Standard.
Obtained-from: DragonFly BSD
Reference: https://pubs.opengroup.org/onlinepubs/9799919799/utilities/timeout.html