add 'override' for scala/scala#5331

scala/scala-dev#203

slick/src/main/scala/slick/util/InternalArrayQueue.scala

@@ -173,7 +173,7 @@ private[util] final class InternalArrayQueue[E >: Null <: AnyRef](capacity: Int)
      x
    }

    def remove(): Unit = throw new UnsupportedOperationException
    override def remove(): Unit = throw new UnsupportedOperationException
  }

}

slick/src/main/scala/slick/util/ManagedArrayBlockingQueue.scala

@@ -209,7 +209,7 @@ class ManagedArrayBlockingQueue[E >: Null <: PrioritizedRunnable](maximumInUse:
      }
    }

    def remove(): Unit = throw new UnsupportedOperationException
    override def remove(): Unit = throw new UnsupportedOperationException
  }

  @inline private[this] def locked[T](f: => T) = {