incubator-core no longer exists

Change-Id: I2b2339c42ec52beb5b5cebcfff8eaffb7fadaa4a
diff --git a/BUCK b/BUCK
index 4045d77..dec82d9 100644
--- a/BUCK
+++ b/BUCK
@@ -32,7 +32,6 @@
     '//core/store/serializers:onos-core-serializers-install',
 
     '//incubator/net:onos-incubator-net-install',
-    '//incubator/core:onos-incubator-core-install',
     '//incubator/store:onos-incubator-store-install',
     '//incubator/rpc:onos-incubator-rpc-install',