Add missing license headers

Source/Core/InputCommon/ControllerInterface/DInput/NamedKeys.h

@@ -1,3 +1,7 @@
+// Copyright 2010 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 { DIK_A, "A" },
 { DIK_B, "B" },
 { DIK_C, "C" },

Source/Core/InputCommon/ControllerInterface/DInput/XInputFilter.h

@@ -1,3 +1,7 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 #pragma once
 
 #include <vector>

Source/Core/InputCommon/ControllerInterface/XInput/XInput.cpp

@@ -1,3 +1,7 @@
+// Copyright 2010 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 
 #include "InputCommon/ControllerInterface/XInput/XInput.h"
 

Source/Core/InputCommon/ControllerInterface/XInput/XInput.h

@@ -1,3 +1,7 @@
+// Copyright 2010 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 // XInput suffers a similar issue as XAudio2. Since Win8, it is part of the OS.
 // However, unlike XAudio2 they have not made the API incompatible - so we just
 // compile against the latest version and fall back to dynamically loading the

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

@@ -1,3 +1,7 @@
+// Copyright 2010 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 #include <cstring>
 #include <X11/XKBlib.h>
 

Source/Core/InputCommon/ControllerInterface/Xlib/Xlib.h

@@ -1,3 +1,7 @@
+// Copyright 2010 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 #pragma once
 
 #include <X11/keysym.h>