fix boost 1.89 compile issue by removing boost system dependency #352
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Boost 1.89 removed the boost_system library, which has been a placeholder since boost 1.69[1]. This broke builds using boost 1.89. This change removes linking boost_system and removes the only place where it has been used. Since C++17, we don't need boost for this.
[1] https://www.boost.org/doc/libs/1_69_0/libs/system/doc/html/system.html#changes_in_boost_1_69