quota: depend on host-nfs-utils

quota: depend on host-nfs-utils

host-nfs-utils provides the host rpcgen utility. This fixes the build on
recent Fedora systems that removed rpcgen from the glibc package.

Fixes:
http://autobuild.buildroot.net/results/730/730acb23663ebbbaba847073979654670a8bc64c/
http://autobuild.buildroot.net/results/e49/e49932e9d958203d585cdddd795df06aad6ff3a9/
http://autobuild.buildroot.net/results/1b7/1b7dccf7b9742d1b9cb57bffe55eac5cfc66b15c/

Cc: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>