change MIN_boost_version

ubuntu version 20.04 is no longer supported.
The minimum boost version used for freecad is now 1.74 (ubuntu 22.04) https://launchpad.net/ubuntu/jammy/+package/libboost-system-dev

src/Gui/AutoSaver.h

@@ -29,7 +29,7 @@
 #include <map>
 #include <set>
 #include <string>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 #include <Base/Writer.h>
 
 namespace App {

src/Gui/Command.h

@@ -28,7 +28,7 @@
 #include <map>
 #include <string>
 #include <vector>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 
 #include <Base/Type.h>
 #include <Gui/Application.h>

src/Gui/DAGView/DAGModel.h

@@ -26,7 +26,7 @@
 #include <memory>
 #include <vector>
 
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 
 #include <QBrush>
 #include <QGraphicsScene>

src/Gui/DAGView/DAGModelGraph.h

@@ -35,7 +35,7 @@
 #include <boost/multi_index_container.hpp>
 #include <boost/multi_index/member.hpp>
 #include <boost/multi_index/ordered_index.hpp>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 
 #include "DAGRectItem.h"
 

src/Gui/DAGView/DAGView.h

@@ -25,7 +25,7 @@
 
 #include <memory>
 #include <QGraphicsView>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 
 #include <Gui/DockWindow.h>
 #include <Gui/Document.h>

src/Gui/Document.h

@@ -26,7 +26,7 @@
 #include <list>
 #include <map>
 #include <string>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 #include <QString>
 
 #include <Base/Persistence.h>

src/Gui/DocumentObserver.h

@@ -24,7 +24,7 @@
 #define GUI_DOCUMENTOBSERVER_H
 
 #include <Base/BaseClass.h>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 
 
 namespace App { class Property; }

src/Gui/ExpressionBinding.h

@@ -27,7 +27,7 @@
 #include <string>
 #include <App/ObjectIdentifier.h>
 #include <QPalette>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 
 
 namespace App {

src/Gui/MDIView.cpp

@@ -23,7 +23,7 @@
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
-# include <boost_signals2.hpp>
+# include <boost/signals2.hpp>
 # include <boost/core/ignore_unused.hpp>
 # include <QApplication>
 # include <QEvent>

src/Gui/MDIView.h

@@ -23,7 +23,7 @@
 #ifndef GUI_MDIVIEW_H
 #define GUI_MDIVIEW_H
 
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 #include <QMainWindow>
 #include <Gui/ActiveObjectList.h>
 #include <Gui/View.h>

src/Gui/ParamHandler.h

@@ -24,7 +24,7 @@
 
 #include <map>
 #include <memory>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 #include <QTimer>
 
 #include <FCGlobal.h>

src/Gui/PreCompiled.h

@@ -82,7 +82,7 @@
 
 // Boost
 #include <boost_graph_adjacency_list.hpp>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/bind/bind.hpp>
 #include <boost/core/ignore_unused.hpp>

src/Gui/ToolBarAreaWidget.h

@@ -26,7 +26,7 @@
 #include <QToolBar>
 #include <QPointer>
 #include <QWidget>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 #include <Base/Parameter.h>
 
 namespace Gui

src/Gui/ToolBarManager.h

@@ -25,7 +25,7 @@
 #define GUI_TOOLBARMANAGER_H
 
 #include <string>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 
 #include <QStringList>
 #include <QPointer>

src/Gui/ViewProvider.h

@@ -28,7 +28,7 @@
 #include <string>
 #include <vector>
 #include <QIcon>
-#include <boost_signals2.hpp>
+#include <boost/signals2.hpp>
 #include <boost/intrusive_ptr.hpp>
 
 #include <App/Material.h>