dont allocate lists for angleoptions.

src/Avalonia.OpenGL/AngleOptions.cs

@@ -10,6 +10,6 @@ namespace Avalonia.OpenGL
 			DirectX11
         }
 
-        public List<PlatformApi> AllowedPlatformApis { get; set; } = null;
+        public IList<PlatformApi> AllowedPlatformApis { get; set; } = null;
     }
 }

src/Avalonia.OpenGL/EglDisplay.cs

@@ -36,7 +36,7 @@ namespace Avalonia.OpenGL
                         throw new OpenGlException("eglGetPlatformDisplayEXT is not supported by libegl.dll");
 
                     var allowedApis = AvaloniaLocator.Current.GetService<AngleOptions>()?.AllowedPlatformApis
-                                      ?? new List<AngleOptions.PlatformApi> {AngleOptions.PlatformApi.DirectX11};
+                                      ?? new [] {AngleOptions.PlatformApi.DirectX11};
 
                     foreach (var platformApi in allowedApis)
                     {