Need to set additional flags and extensions for newer versions of Vulkan SDK on Mac

[annethereshewent]

Hello, I found an issue on Mac with a fairly simple fix in the source code, so it turns out that for newer versions of Vulkan SDK, there are some additional flags that need to be set for Vulkan to work on Mac. if you don't, it will throw a VK_ERROR_INCOMPATIBLE_DRIVER when creating an instance. Per https://stackoverflow.com/questions/72789012/why-does-vkcreateinstance-return-vk-error-incompatible-driver-on-macos-despite, the fix is quite simple:

• Enable the VK_KHR_portability_enumeration instance extension
• Add (or set) the VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR flag for your instance create info
• (optional?) Enable the VK_KHR_portability_subset device extension

I only had to do the first two to get things to work properly but it might be worth it to do all three.

[AXDOOMER]

@annethereshewent Do you think you could create a PR with the fix? I don't think parallel-rdp devs have a Mac to test with.