Suppressed an annoying, unnecessary compiler warning. :)

DotSDL/Sdl/Keyboard.cs

@@ -6,6 +6,9 @@ namespace DotSDL.Sdl {
     /// </summary>
     internal static class Keyboard {
         internal struct Keysym {
+            // Since this is used for interop, suppress the "never assigned to" warning.
+            #pragma warning disable 0649
+
             /// <summary>
             /// SDL physical key code.
             /// </summary>
@@ -21,6 +24,8 @@ namespace DotSDL.Sdl {
             /// </summary>
             internal Keymod Mod;
             internal uint Unused;
+
+            #pragma warning restore 0649
         }
     }
 }