Fix for building tcpdump
Fix for building tcpdump

xuzhaokui/PF_RING,zhongpei/PF_RING,rgv151/PF_RING,rgv151/PF_RING,opencTM/PF_RING,zhongpei/PF_RING,ntop/PF_RING,mehulsbhatt/PF_RING,xuzhaokui/PF_RING,ntop/PF_RING,opencTM/PF_RING,zhongpei/PF_RING,ntop/PF_RING,mehulsbhatt/PF_RING,xuzhaokui/PF_RING,xuzhaokui/PF_RING,ntop/PF_RING,mehulsbhatt/PF_RING,zhongpei/PF_RING,mehulsbhatt/PF_RING,rgv151/PF_RING,ntop/PF_RING,opencTM/PF_RING,ntop/PF_RING,ntop/PF_RING,rgv151/PF_RING,opencTM/PF_RING