Problem
=======

build with ASAN leads to test failures when running tests that use the
mock-server which reports:

    plugin_output_directory/mock_server.so: undefined symbol:
_ZNK11mysqlrouter16BasePluginConfig16get_section_nameB5cxx11EPKN13mysql_harness13ConfigSectionE

which translates to:

    mysqlrouter::BasePluginConfig::get_section_name[abi:cxx11]
    (mysql_harness::ConfigSection const*) const

Change
======

- explicitly link against harness-library

RB: 24405