bug 14016: Make vkResetFences take const pFences

https://cvs.khronos.org/bugzilla/show_bug.cgi?id=14016
diff --git a/layers/mem_tracker.cpp b/layers/mem_tracker.cpp
index 52b2e78..099a6b2 100644
--- a/layers/mem_tracker.cpp
+++ b/layers/mem_tracker.cpp
@@ -1291,7 +1291,7 @@
 VK_LAYER_EXPORT VkResult VKAPI vkResetFences(
     VkDevice  device,
     uint32_t  fenceCount,
-    VkFence  *pFences)
+    const VkFence  *pFences)
 {
     /*
      * TODO: Shouldn't we check for error conditions before passing down the chain?