some third-party library need upgrade

with higher gcc version, old code may easy fail to compile because of more strict flags given from gcc by default.

here are few know problems:
- zookeeper c client:
- libcppunit change: https://github.com/apache/zookeeper/pull/803
- compile flag changes: https://issues.apache.org/jira/browse/ZOOKEEPER-3293

anyway, zookeeper need consider backward compatible

- libunwind
- https://github.com/libunwind/libunwind/pull/166

- boost: see if we can remove it, use abseil or std

Identify the third-party dependencies in the build configuration (likely CMakeLists.txt or similar). Check the linked upstream issues for zookeeper and libunwind to understand the required changes. Assess if boost can be replaced with abseil or std by examining the code that uses it. Testing involves ensuring the project compiles with a higher GCC version.

Written by the indexing model from the issue text.