buildroot

package/eudev: don't forcibly link with -lrt

This was carried over from udev back when it were an separate package,
but was not even needed by eudev 1.3 when we introduced it back in 2014
(937a95449ec: eudev: new package).

Drop it now.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
Cc: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>