Vulkan: Add MoltenVK and portability to MacOS library names (#1419)

* Vulkan: Add MoltenVK and portability to MacOS library names

MoltenVK is (obviously) above portability, and while gfx-rs/portability is dead development wise,
there are likely people who want to package it with their app and use it for whatever reason,
so lets shove it at the end of the libnames to check, since we are able to, and shouldnt hurt anything

* Vulkan: Remove libportability

Author: Beyley

src/Vulkan/Silk.NET.Vulkan/VulkanLibraryNameContainer.cs

@@ -14,7 +14,7 @@ internal class VulkanLibraryNameContainer : SearchPathContainer
         public override string[] Linux => new[] { "libvulkan.so.1" };
 
         /// <inheritdoc />
-        public override string[] MacOS => new[] { "libvulkan.dylib" };
+        public override string[] MacOS => new[] { "libvulkan.dylib", "libMoltenVK.dylib" };
 
         /// <inheritdoc />
         public override string[] Android => new[] { "libvulkan.so" };