IP_Pipeline app is not supported in FreeBSD environment. Therefore,
skip it while building the sample apps on FreeBSD.
Fixes: 4bbf8e30aa5e ("examples/ip_pipeline: add CLI interface")
Fixes: 2f74ae28e23f ("examples/ip_pipeline: add tap object")
Signed-off-by: Jasvinder Singh <jasvinder.singh@intel.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>