Backport missing includes causing issues with gcc12.
https://bugs.gentoo.org/858725
https://gitlab.com/OpenMW/openmw/-/commit/5f2e282359
From: elsid <elsid.mail@gmail.com>
Date: Tue, 17 May 2022 00:58:24 +0200
Subject: [PATCH] Add includes for used types and functions
--- a/components/myguiplatform/myguidatamanager.cpp
+++ b/components/myguiplatform/myguidatamanager.cpp
@@ -1,8 +1,11 @@
 #include "myguidatamanager.hpp"
 
+#include <memory>
+#include <string>
+
 #include <MyGUI_DataFileStream.h>
 
-#include <boost/filesystem.hpp>
+#include <boost/filesystem/operations.hpp>
 #include <boost/filesystem/fstream.hpp>
 
 #include <components/debug/debuglog.hpp>
--- a/components/myguiplatform/myguidatamanager.hpp
+++ b/components/myguiplatform/myguidatamanager.hpp
@@ -3,6 +3,8 @@
 
 #include <MyGUI_DataManager.h>
 
+#include <string>
+
 namespace osgMyGUI
 {
 
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