loader: Fixes for ICD vk{Create|Destroy}SurfaceKHR
loader: Fixes for ICD vk{Create|Destroy}SurfaceKHR

Need to keep VkIcdSurface private to the loader.

The definition may conflict with some redefinitions of
VK_DEFINE_NON_DISPATCHABLE_HANDLE and it's not necessary to make public
anyway.

Change-Id: I30e166f0ecce2fd3ea36c745dc073b705973d75f

KhronosGroup/Vulkan-Headers,KhronosGroup/Vulkan-Headers,KhronosGroup/Vulkan-Headers