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