games/anki: Update to 2.1.35
Since the 2.1.17 release the build system has been significantly revised and
contains many changes (e.g. a Rust library with Python bindings) that had to
be adapted to the Ports framework.
Kudos to David Schlachter for the additional testing and feedback!
Changelog since 2.1.16 (too many changes to list them separately):
PR: 247666
Reported by: David Schlachter
Reviewed by: tcberner (earlier revision)
Differential Revision: https://reviews.freebsd.org/D26961