Install to /lib/systemd/system-sleep if the distribution patches systemd

This fixes suspend behaviour on Ubuntu

Fixes milgner#16

CMakeLists.txt

@@ -28,8 +28,15 @@ if(INSTALL_UDEV_RULE)
 endif()
 if(INSTALL_SYSTEMD_SLEEP_SCRIPT)
   configure_file(k290-fnkeyctl.sh.in ${CMAKE_CURRENT_BINARY_DIR}/k290-fnkeyctl.sh @ONLY)
-  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/k290-fnkeyctl.sh DESTINATION /usr/lib/systemd/system-sleep/)
+  if(IS_DIRECTORY /usr/lib/systemd/system-sleep/)
+    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/k290-fnkeyctl.sh DESTINATION /usr/lib/systemd/system-sleep/)
+  endif()
+  # some distributions (e.g. Ubuntu) patch systemd to use /lib/systemd/system-sleep/ instead
+  if(IS_DIRECTORY /lib/systemd/system-sleep/)
+    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/k290-fnkeyctl.sh DESTINATION /lib/systemd/system-sleep/)
+  endif()
 endif()
+
 if(INSTALL_PM_UTILS_SLEEP_SCRIPT)
   configure_file(20-k290.sh.in ${CMAKE_CURRENT_BINARY_DIR}/20-k290.sh @ONLY)
   install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/20-k290.sh DESTINATION /etc/pm/sleep.d/)