[upstream] Disable calls to isfinite when compiling with -ffast-math …

…(recastnavigation 747)

- recastnavigation/recastnavigation#747

src/DotRecast.Detour.TileCache/DtTileCacheBuilder.cs

@@ -1395,17 +1395,6 @@ public static void RemoveVertex(DtTileCachePolyMesh mesh, int rem, int maxTris)
         {
             // Count number of polygons to remove.
             int maxVertsPerPoly = mesh.nvp;
-            int numRemovedVerts = 0;
-            for (int i = 0; i < mesh.npolys; ++i)
-            {
-                int p = i * maxVertsPerPoly * 2;
-                int nv = CountPolyVerts(mesh.polys, p, maxVertsPerPoly);
-                for (int j = 0; j < nv; ++j)
-                {
-                    if (mesh.polys[p + j] == rem)
-                        numRemovedVerts++;
-                }
-            }
 
             int nedges = 0;
             List<int> edges = new List<int>();