Fixed the system module linking itself when auto-compiling.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Driver.cs

@@ -434,8 +434,9 @@ namespace CppSharp
                     CompilerOptions = compilerOptions.ToString()
                 };
 
-            compilerParameters.ReferencedAssemblies.Add(
-                string.Format("{0}.dll", AST.Module.SystemModule.LibraryName));
+            if (module != AST.Module.SystemModule)
+                compilerParameters.ReferencedAssemblies.Add(
+                    string.Format("{0}.dll", AST.Module.SystemModule.LibraryName));
             // add a reference to System.Core
             compilerParameters.ReferencedAssemblies.Add(typeof(Enumerable).Assembly.Location);