replace and purge boost::math::gcd and other non-used headers

apps/essimporter/main.cpp

@@ -2,8 +2,6 @@
 
 #include <boost/program_options.hpp>
 #include <boost/filesystem.hpp>
-#include <boost/filesystem/path.hpp>
-#include <boost/filesystem/fstream.hpp>
 
 #include <components/files/configurationmanager.hpp>
 

apps/launcher/graphicspage.cpp

@@ -12,17 +12,11 @@
 
 #include <SDL_video.h>
 
-#include <boost/math/common_factor.hpp>
-
 #include <components/files/configurationmanager.hpp>
 
-#include <components/contentselector/model/naturalsort.hpp>
-
-#include <components/settings/settings.hpp>
-
 QString getAspect(int x, int y)
 {
-    int gcd = boost::math::gcd (x, y);
+    int gcd = std::__gcd (x, y);
     int xaspect = x / gcd;
     int yaspect = y / gcd;
     // special case: 8 : 5 is usually referred to as 16:10

apps/openmw/main.cpp

@@ -1,5 +1,4 @@
 #include <iostream>
-#include <cstdio>
 
 #include <components/version/version.hpp>
 #include <components/files/configurationmanager.hpp>
@@ -7,13 +6,8 @@
 #include <components/fallback/validate.hpp>
 
 #include <SDL_messagebox.h>
-#include <SDL_main.h>
 #include "engine.hpp"
 
-#include <boost/iostreams/concepts.hpp>
-#include <boost/iostreams/stream_buffer.hpp>
-#include <boost/filesystem/fstream.hpp>
-
 #if defined(_WIN32)
 // For OutputDebugString
 #ifndef WIN32_LEAN_AND_MEAN

apps/openmw/mwgui/settingswindow.cpp

@@ -3,17 +3,14 @@
 #include <MyGUI_ScrollBar.h>
 #include <MyGUI_Window.h>
 #include <MyGUI_ComboBox.h>
-#include <MyGUI_ListBox.h>
 #include <MyGUI_ScrollView.h>
 #include <MyGUI_Gui.h>
 #include <MyGUI_TabControl.h>
 
 #include <boost/algorithm/string.hpp>
-#include <boost/math/common_factor_rt.hpp>
 
 #include <SDL_video.h>
 
-#include <components/misc/stringops.hpp>
 #include <components/widgets/sharedstatebutton.hpp>
 #include <components/settings/settings.hpp>
 
@@ -57,7 +54,7 @@ namespace
 
     std::string getAspect (int x, int y)
     {
-        int gcd = boost::math::gcd (x, y);
+        int gcd = std::__gcd (x, y);
         int xaspect = x / gcd;
         int yaspect = y / gcd;
         // special case: 8 : 5 is usually referred to as 16:10