userland: add examples to 'install' in Makefile
userland: add examples to 'install' in Makefile

Install 'examples' and 'examples_zc' when running 'make install'.

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