Add option to use elogind

Signed-off-by: Stephan Lachnit <stephanlachnit@protonmail.com>

daemon/gamemode-dbus.c

@@ -36,8 +36,13 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "common-logging.h"
 #include "common-pidfds.h"
 
+#ifdef USE_ELOGIND
+#include <elogind/sd-bus.h>
+#include <elogind/sd-daemon.h>
+#else
 #include <systemd/sd-bus.h>
 #include <systemd/sd-daemon.h>
+#endif
 
 #include <assert.h>
 #include <errno.h>

daemon/meson.build

@@ -17,6 +17,7 @@ gamemoded_includes += config_h_dir
 gamemoded = executable(
     'gamemoded',
     sources: daemon_sources,
+    c_args: elogind_args,
     dependencies: [
         link_daemon_common,
         dep_threads,