COmmon, xrCore: refactor SDL2 includes

Author: eagleivg

src/Common/Common.hpp

@@ -6,12 +6,5 @@
 #include "Common/FSMacros.hpp"
 #include "Include/xrAPI/xrAPI.h"
 
-#if defined(WINDOWS)
-#if __has_include("SDL.h")
 #include "SDL.h"
-#endif
-
-#if __has_include("SDL_syswm.h")
 #include "SDL_syswm.h"
-#endif
-#endif

src/xrCore/xrMemory.cpp

@@ -1,7 +1,5 @@
 #include "stdafx.h"
 
-#include "SDL.h"
-
 #if defined(WINDOWS)
 #include <Psapi.h>
 #elif defined(LINUX)