When running as KVM or Xen guest, packets may be received with
incomplete checksum[1]. Patch adopted from Fedora dhcp package.
[1]. http://article.gmane.org/gmane.linux.kernel/1003853
Signed-off-by: Alexey I. Froloff <raorn@raorn.name>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33475 3c298f89-4303-0410-b956-a3cf2f4a3e73
