layers: Fix CreateSemaphore/CreateEvent conflict
layers: Fix CreateSemaphore/CreateEvent conflict

Reorder includes to avoid conflicts between the VkLayerDispatchTable_
CreateSemaphore/CreateEvent fields and the WIN32 API.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools