Fix build without PCH for some targets.

Patch By: Angen
Reviewed By: vladislavbelov
Tested By: Stan, vladislavbelov
Differential Revision: https://code.wildfiregames.com/D1361
This was SVN commit r21964.

source/scriptinterface/ScriptInterface.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2017 Wildfire Games.
+/* Copyright (C) 2018 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -18,14 +18,14 @@
 #ifndef INCLUDED_SCRIPTINTERFACE
 #define INCLUDED_SCRIPTINTERFACE
 
-#include <boost/random/linear_congruential.hpp>
-
 #include "lib/file/vfs/vfs_path.h"
-
 #include "maths/Fixed.h"
 #include "ScriptTypes.h"
 #include "ps/Errors.h"
 
+#include <boost/random/linear_congruential.hpp>
+#include <map>
+
 ERROR_GROUP(Scripting);
 ERROR_TYPE(Scripting, SetupFailed);