Adapt to current deadbeef API:
  - state callback now returns ddb_playback_state_t (enum), not int
  - ddb_waveformat_t.is_bigendian was removed

--- a/ddb_jack.c
+++ b/ddb_jack.c
@@ -334,7 +334,7 @@ static int ddb_jack_start (void)
     return 0;
 }

-static int ddb_playback_state (void)
+static ddb_playback_state_t ddb_playback_state (void)
 {
     trace (__func__);
     return ddb_client.state;
@@ -407,7 +407,6 @@ DB_output_t plugin = {
         .is_float = 1,
         .channels = 2,
         .channelmask = DDB_SPEAKER_FRONT_LEFT | DDB_SPEAKER_FRONT_RIGHT,
-        .is_bigendian = 0,
     },
     .has_volume = 1,
 };