MFH: r538136

emulators/ppsspp: unbreak Vulkan on Wayland after r512863

Regressed by https://github.com/hrydgard/ppsspp/commit/3e4faea6adcb

$ SDL_VIDEODRIVER=wayland LD_PRELOAD=libGLEW-wayland.so ppsspp
[...]
I: VulkanLoader.cpp:451: VulkanLoad: Found library 'libvulkan.so'
W: VulkanLoader.cpp:472: VulkanLoad: Base functions loaded.
W: VulkanLoader.cpp:548: Vulkan instance functions loaded.
I: VulkanContext.cpp:502: Chose physical device 0: 0x8056427c0
I: VulkanContext.cpp:538: Memory Types (1):
I: VulkanContext.cpp:547: 0: Heap 0; Flags: DEVICE_LOCAL HOST_VISIBLE HOST_CACHED HOST_COHERENT
W: VulkanLoader.cpp:555: Vulkan device functions loaded.
I: VulkanLoader.cpp:571: Missing (device): vkGetPhysicalDeviceSparseImageFormatProperties
I: VulkanContext.cpp:659: Device created.

Vulkan subsystem 6 not supported

Approved by: ports-secteam blanket