Fix build when ccd_real_t == float

libccd supports single or double precision builds.
It seems like the developers build it with double precision.
But if you actually require double precision you should check for it in the configuration.

include/fcl/narrowphase/detail/convexity_based_algorithm/gjk_libccd-inl.h

@@ -1693,7 +1693,8 @@ static void validateNearestFeatureOfPolytopeBeingEdge(ccd_pt_t* polytope) {
   // for this possibility.
   const ccd_real_t v0_dist =
       std::sqrt(ccdVec3Len2(&nearest_edge->vertex[0]->v.v));
-  const ccd_real_t plane_threshold = kEps * std::max(1.0, v0_dist);
+  const ccd_real_t plane_threshold =
+      kEps * std::max(static_cast<ccd_real_t>(1.0), v0_dist);
 
   for (int i = 0; i < 2; ++i) {
     face_normals[i] =