Update DetourTileCacheBuilder.cpp

DetourTileCache/Source/DetourTileCacheBuilder.cpp

@@ -1068,6 +1068,7 @@ static bool buildMeshAdjacency(dtTileCacheAlloc* alloc,
 }
 
 
+// Last time I checked the if version got compiled using cmov, which was a lot faster than module (with idiv).
 inline int prev(int i, int n) { return i-1 >= 0 ? i-1 : n-1; }
 inline int next(int i, int n) { return i+1 < n ? i+1 : 0; }