On FreeBSD it's not necessary to use -ldl to link apps which use
dlopen. This error only showed up with a shared library gcc build,
not standard build using static libs.
Fixes: 1131cbf0fb2b ("net/ark: stub PMD for Atomic Rules Arkville") Signed-off-by: Bruce Richardson <bruce.richardson@intel.com> Acked-by: John Miller <john.miller@atomicrules.com>