This is a backport from the busybox repository
(192dce4b84fb32346ebc5194de7daa5da3b8d1b4); it enables the use of the
suppress_{prefixlength,ifgroup} flags for policy routing rules.
Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
(cherry picked from commit de6ff1512955953e56735896c044c7aac97e14d9)