The function pointer definition for the Physical device extensions
was incorrect. Updated to work properly and remove clang warning.
This was also causing an issue with Tony's latest test.
Change-Id: Ibdd19754a4394d1b88d3a20268238baaf3ec0907
typedef VkResult (VKAPI_PTR *PFN_vkNegotiateLoaderLayerInterfaceVersion)(VkNegotiateLayerInterface *pVersionStruct);
// Function prototype for unknown physical device extension command
-typedef VkResult(VKAPI_PTR *PFN_PhysDevExt)(VkPhysicalDevice phys_device, ...);
+typedef VkResult(VKAPI_PTR *PFN_PhysDevExt)(VkPhysicalDevice phys_device);
// ------------------------------------------------------------------------------------------------
// CreateInstance and CreateDevice support structures