infra: chore: fix/silence compile warnings

src/Ryujinx.Graphics.Metal/EncoderStateManager.cs

@@ -1767,6 +1767,7 @@ namespace Ryujinx.Graphics.Metal
                 Constants.StorageBuffersSetIndex => Constants.StorageBuffersIndex,
                 Constants.TexturesSetIndex => Constants.TexturesIndex,
                 Constants.ImagesSetIndex => Constants.ImagesIndex,
+                _ => throw new NotImplementedException()
             };
         }
 

src/Ryujinx.Graphics.Metal/MetalRenderer.cs

@@ -21,9 +21,12 @@ namespace Ryujinx.Graphics.Metal
         private Pipeline _pipeline;
         private Window _window;
         
-        public uint ProgramCount { get; set; } = 0;
+        public uint ProgramCount { get; set; }
 
+#pragma warning disable CS0067 // The event is never used
         public event EventHandler<ScreenCaptureImageInfo> ScreenCaptured;
+#pragma warning restore CS0067
+        
         public bool PreferThreading => true;
         public IPipeline Pipeline => _pipeline;
         public IWindow Window => _window;