ibus-engines.anthy: 1.5.9 -> 1.5.10

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. These checks were done:

- built on NixOS
/tmp/tmp.2tbPvTstTb /home/ryantm/.cache/nixpkgs
/home/ryantm/.cache/nixpkgs
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 1.5.10 with grep in /nix/store/3h4a30xh4ddij4i5nmyi8p478y804jv7-ibus-anthy-1.5.10
- directory tree listing: https://gist.github.com/2a6dbfad474173b76f5f0d7aa35964f6