Fix unused variable warning introduced by #446

[bobpaw]

Fix unused variable warning introduced by #446

This fixes an unused warning when CMake is given -DENABLE_CAPSTONE by casting to void.

However, I wonder if we can remove the #ifndef altogether? Currently we expect Capstone meshes to never be periodic. But if they are periodic, I would expect we might want to do the recalculation.

[cwsmith]

LGTM.

I'm not familiar enough with the context of the ifdef to provide a helpful response regarding its existence/usefulness.

[bobpaw]

@onkarsahni Do you have any insights in terms of Capstone and periodic meshes? Is that something they might support in the future? If we remove the #ifndef HAVE_CAPSTONE the expensive parametric call still won't be made unless it's a 2d periodic mesh.