japanese/canna-server: Update to 3.7p5 and take maintainership

Update MASTER_SITES and WWW.
Do not install TeX format documents.
Remove MAKE_ARGS.
Switch cannakill's symbolic link from absolute path to relative path.

Changelog (japanese):
https://github.com/canna-input/canna/blob/5bd95e546e8785fd5b46d1216cf4dde2df6a2d46/CHANGES.jp#L131

PR: 288911
Co-authored-by: AIDA Shinra <shinra@j10n.org>
Approved by: hrs (maintainer timeout > 3 months)
Approved by: osa (mentor)