updates for Boost 1.85
https://github.com/freeorion/freeorion/commit/bc02d58fc1efc70c6c3d33c20a71ef0dd4852d23

Index: util/OptionsDB.cpp
--- util/OptionsDB.cpp.orig
+++ util/OptionsDB.cpp
@@ -14,8 +14,7 @@
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/erase.hpp>
 #include <boost/algorithm/string/predicate.hpp>
-#include <boost/filesystem/fstream.hpp>
-#include <boost/filesystem/operations.hpp>
+#include <boost/filesystem.hpp>
 #include <boost/range/algorithm_ext/erase.hpp>
 #include <boost/tokenizer.hpp>
 
