removed examples_libzero from Makefile
removed examples_libzero from Makefile

ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING,opencTM/PF_RING,ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING,ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING,ntop/PF_RING