Teach gamemoded the '-r' option

This allows for easy requesting of gamemode and pausing for any signal

	Primarily useful for simple tests, but also functionally to allow enterning and exiting gamemode manually

daemon/meson.build

@@ -32,9 +32,11 @@ executable(
         dep_threads,
         dep_systemd,
         inih_dependency,
+        libdl,
     ],
     include_directories: [
         config_h_dir,
+        libgamemode_includes,
     ],
     install: true,
 )