Merge Request for #4871: change unittest code for support LLVM. (#4878)

 MacOS clang/llvm compiler imcompatible code in Unit test case BasicEndToEndTest.cc #4871

pulsar-client-cpp/tests/BasicEndToEndTest.cc

@@ -2327,7 +2327,7 @@ TEST(BasicEndToEndTest, testSyncFlushBatchMessagesPartitionedTopic) {
     consConfig.setConsumerType(ConsumerExclusive);
     consConfig.setReceiverQueueSize(2);
     ASSERT_FALSE(consConfig.hasMessageListener());
-    Consumer consumer[numberOfPartitions];
+    std::vector<Consumer> consumer(numberOfPartitions);
     Result subscribeResult;
     for (int i = 0; i < numberOfPartitions; i++) {
         std::stringstream partitionedTopicName;
@@ -2539,7 +2539,7 @@ TEST(BasicEndToEndTest, testFlushInPartitionedProducer) {
     consConfig.setConsumerType(ConsumerExclusive);
     consConfig.setReceiverQueueSize(2);
     ASSERT_FALSE(consConfig.hasMessageListener());
-    Consumer consumer[numberOfPartitions];
+    std::vector<Consumer> consumer(numberOfPartitions);
     Result subscribeResult;
     for (int i = 0; i < numberOfPartitions; i++) {
         std::stringstream partitionedTopicName;