/etc/mysql/conf.d/tokudb.cnf is in mariadb-server-10.0 10.0.32-0+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# See https://mariadb.com/kb/en/how-to-enable-tokudb-in-mariadb/
# for instructions how to enable TokuDB
#
# See https://mariadb.com/kb/en/tokudb-differences/ for differences
# between TokuDB in MariaDB and TokuDB from http://www.tokutek.com/
#plugin-load-add=ha_tokudb.so
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