Remove service_utils.cpp

It's empty so remove it.

src/effects/CMakeLists.txt

@@ -165,11 +165,7 @@ add_subdirectory(wobblywindows)
 ###############################################################################
 
 # Add the builtins plugin
-set(kwin4_effect_builtins_sources
-    ../service_utils.cpp
-)
-
-add_library(kwin4_effect_builtins STATIC ${kwin4_effect_builtins_sources})
+add_library(kwin4_effect_builtins STATIC)
 kcoreaddons_target_static_plugins(kwin4_effect_builtins "kwin/effects/plugins" LINK_OPTION "PRIVATE")
 target_link_libraries(kwin4_effect_builtins PRIVATE
     ${kwin_effect_KDE_LIBS}

src/service_utils.cpp

-/*
-    KWin - the KDE window manager
-    This file is part of the KDE project.
-
-    SPDX-FileCopyrightText: 2020 Méven Car <meven.car@enioka.com>
-
-    SPDX-License-Identifier: GPL-2.0-or-later
-*/
-
-/*
-
- This file is for (very) small utility relating to services/process.
-
-*/
-#include "service_utils.h"
-
-namespace KWin
-{
-
-}// namespace
-