CMake: remove extraneous TestUtils directory

Source/UnitTests/TestUtils/StubHost.cpp

@@ -1,69 +0,0 @@
-// Copyright 2014 Dolphin Emulator Project
-// Licensed under GPLv2+
-// Refer to the license.txt file included.
-
-// Stub implementation of the Host_* callbacks for tests. These implementations
-// do nothing except return default values when required.
-
-#include <memory>
-#include <string>
-
-#include "Common/GL/GLInterfaceBase.h"
-#include "Core/Host.h"
-
-void Host_NotifyMapLoaded()
-{
-}
-void Host_RefreshDSPDebuggerWindow()
-{
-}
-void Host_Message(int)
-{
-}
-void* Host_GetRenderHandle()
-{
-  return nullptr;
-}
-void Host_UpdateTitle(const std::string&)
-{
-}
-void Host_UpdateDisasmDialog()
-{
-}
-void Host_UpdateMainFrame()
-{
-}
-void Host_RequestRenderWindowSize(int, int)
-{
-}
-void Host_SetStartupDebuggingParameters()
-{
-}
-bool Host_UIHasFocus()
-{
-  return false;
-}
-bool Host_RendererHasFocus()
-{
-  return false;
-}
-bool Host_RendererIsFullscreen()
-{
-  return false;
-}
-void Host_ConnectWiimote(int, bool)
-{
-}
-void Host_SetWiiMoteConnectionState(int)
-{
-}
-void Host_ShowVideoConfig(void*, const std::string&)
-{
-}
-void Host_YieldToUI()
-{
-}
-std::unique_ptr<cInterfaceBase> HostGL_CreateGLInterface()
-{
-  return nullptr;
-}