Add missing license headers

Source/Core/Core/IPC_HLE/ICMP.h

@@ -1,3 +1,7 @@
+// Copyright 2012 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 #pragma once
 
 #ifdef _WIN32

Source/Core/Core/IPC_HLE/ICMPLin.cpp

@@ -1,3 +1,7 @@
+// Copyright 2012 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 #include "ICMP.h"
 
 // Currently stubbed. AFAIK (delroth) there is no way to send ICMP echo

Source/Core/Core/IPC_HLE/ICMPWin.cpp

@@ -1,3 +1,7 @@
+// Copyright 2012 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 #include "Core/IPC_HLE/ICMP.h"
 
 enum

Source/Core/Core/IPC_HLE/hci.h

@@ -1,3 +1,7 @@
+// Copyright 2008 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 // Dolphin notes:
 //  Added some info from bluetooth.h
 //  All packet headers have had the packet type field removed. This is because

Source/Core/Core/IPC_HLE/l2cap.h

@@ -1,3 +1,7 @@
+// Copyright 2008 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
 /*      $NetBSD: l2cap.h,v 1.9 2009/09/13 18:45:11 pooka Exp $  */
 
 /*-