remove config_assign.cpp which causes a warning as it's empty

projectfiles/CodeBlocks/wesnoth.cbp

@@ -212,7 +212,6 @@
 		<Unit filename="..\..\src\commandline_options.hpp" />
 		<Unit filename="..\..\src\config.cpp" />
 		<Unit filename="..\..\src\config.hpp" />
-		<Unit filename="..\..\src\config_assign.cpp" />
 		<Unit filename="..\..\src\config_assign.hpp" />
 		<Unit filename="..\..\src\config_cache.cpp" />
 		<Unit filename="..\..\src\config_cache.hpp" />

projectfiles/VC9/wesnothlib.vcproj

@@ -385,10 +385,6 @@
 			RelativePath="..\..\src\config.hpp"
 			>
 		</File>
-		<File
-			RelativePath="..\..\src\config_assign.cpp"
-			>
-		</File>
 		<File
 			RelativePath="..\..\src\config_assign.hpp"
 			>

src/CMakeLists.txt

@@ -702,7 +702,6 @@ set(wesnoth-main_SRC
 	callable_objects.cpp
 	commandline_options.cpp
 	config_cache.cpp
-	config_assign.cpp
 	controller_base.cpp
 	desktop_util.cpp
 	dialogs.cpp

src/SConscript

@@ -74,7 +74,6 @@ libwesnoth_sources = Split("""
     pathfind/astarsearch.cpp
     builder.cpp
     clipboard.cpp
-    config_assign.cpp
     construct_dialog.cpp
     cursor.cpp
     display.cpp

src/config_assign.cpp

@@ -1,13 +0,0 @@
-/*
-   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY.
-
-   See the COPYING file for more details.
-*/
-#include "config_assign.hpp"