/usr/lib/mysql/plugin/ is in mariadb-connect-engine-10.0 10.0.32-0+deb8u1.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/mysql/plugin/ha_connect.so
    
 | application/x-sharedlib | root:root | 0o644 | 1.4 MB |