test: Don't run test on hpp::fcl::Convex without Qhull

test/serialization.cpp

@@ -508,6 +508,7 @@ BOOST_AUTO_TEST_CASE(test_shapes) {
     test_serialization(plane, plane_copy);
   }
 
+#ifdef HPP_FCL_HAS_QHULL
   {
     const size_t num_points = 500;
     std::shared_ptr<std::vector<Vec3f>> points =
@@ -526,6 +527,7 @@ BOOST_AUTO_TEST_CASE(test_shapes) {
     Convex convex_copy;
     test_serialization(*convex, convex_copy);
   }
+#endif
 }
 
 #ifdef HPP_FCL_HAS_OCTOMAP