Eradicate ☠ Mono ☠

Co-Authored-By: Gustas <37534529+punkpun@users.noreply.github.com>

OpenRA.Game/Game.cs

@@ -429,16 +429,9 @@ namespace OpenRA
 		{
 			var rendererPath = Path.Combine(Platform.BinDir, "OpenRA.Platforms." + platformName + ".dll");
 
-#if NET5_0_OR_GREATER
 			var loader = new AssemblyLoader(rendererPath);
 			var platformType = loader.LoadDefaultAssembly().GetTypes().SingleOrDefault(t => typeof(IPlatform).IsAssignableFrom(t));
 
-#else
-			// NOTE: This is currently the only use of System.Reflection in this file, so would give an unused using error if we import it above
-			var assembly = System.Reflection.Assembly.LoadFile(rendererPath);
-			var platformType = assembly.GetTypes().SingleOrDefault(t => typeof(IPlatform).IsAssignableFrom(t));
-#endif
-
 			if (platformType == null)
 				throw new InvalidOperationException("Platform dll must include exactly one IPlatform implementation.");