chore: Add <cfloat> header for simple_knn.cu

(ensures FLT_MAX is defined, fixing undefined identifier errors in simple_knn.cu)

simple-knn/simple_knn.cu

@@ -23,6 +23,7 @@
 #define __CUDACC__
 #include <cooperative_groups.h>
 #include <cooperative_groups/reduce.h>
+#include <cfloat>
 
 namespace cg = cooperative_groups;
 
@@ -218,4 +219,4 @@ void SimpleKNN::knn(int P, float3* points, float* meanDists)
 	boxMeanDist << <num_boxes, BOX_SIZE >> > (P, points, indices_sorted.data().get(), boxes.data().get(), meanDists);
 
 	cudaFree(result);
-}
+}