build error in thirdparty zk when using gcc 8.3

## Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?
gcc8.3.1 build thirdparty zk3.4.10

2. What did you expect to see?
No error

3. What did you see instead?
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897892

4. What version of Pegasus are you using?

## Fix solutions

https://salsa.debian.org/java-team/zookeeper/commit/8f12c964bbc1fc1c025d5fc5e7011a5a67d75181

Start by reading the linked Debian bug report and the referenced ZooKeeper commit, then reproduce the thirdparty zk3.4.10 build with gcc 8.3.1. Done means the Pegasus build completes without the reported error.

Written by the indexing model from the issue text.