These functions are part of the VK_KHR_swapchain + VK1.1 interaction.

Test: dEQP-VK.wsi.xlib.*
Bug: b/124265819
Change-Id: Ic79bb0c290e68ab73ddc589c95f979603ecd1a82
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29168
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>