(svn r11777) -Codechange: split the string header and make do not include it when it's not necessary.

src/newgrf_gui.cpp

@@ -15,6 +15,7 @@
 #include "strings_func.h"
 #include "window_func.h"
 #include "core/alloc_func.hpp"
+#include "string_func.h"
 
 /** Parse an integerlist string and set each found value
  * @param p the string to be parsed. Each element in the list is seperated by a