Added some headers to allow Dolphin to compile in my environment.

Source/Core/Common/GL/GLInterface/EGL.cpp

@@ -2,6 +2,9 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <array>
+#include <cstdlib>
+
 #include "Common/GL/GLInterface/EGL.h"
 #include "Common/Logging/Log.h"
 

Source/Core/Core/HW/VideoInterface.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <cmath>
+
 #include "Common/ChunkFile.h"
 #include "Common/CommonTypes.h"
 #include "Common/MathUtil.h"

Source/Core/InputCommon/ControllerInterface/Xlib/XInput2.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <cmath>
+#include <cstdlib>
 #include <cstring>
 #include <X11/XKBlib.h>