loader: Create defaults for which platforms WSI is supported on.
loader: Create defaults for which platforms WSI is supported on.

Windows: VK_USE_PLATFORM_WIN32_KHR
Linux:   VK_USE_PLATFORM_XCB_KHR

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