Marked libecasound interface v21 as frozen for 2.6.0.
Marked libecasound interface v21 as frozen for 2.6.0.

jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2,jeremysalwen/Ecasound-LV2