queue/Queue: allocate MoveRange() buffer on the heap

No variable-length arrays on the stack.

src/queue/Queue.cxx

@@ -150,7 +150,8 @@ Queue::MovePostion(unsigned from, unsigned to) noexcept
 void
 Queue::MoveRange(unsigned start, unsigned end, unsigned to) noexcept
 {
-	Item tmp[end - start];
+	const auto tmp = std::make_unique<Item[]>(end - start);
+
 	// Copy the original block [start,end-1]
 	for (unsigned i = start; i < end; i++)
 		tmp[i - start] = items[i];