Log Message:
1) Update Canna to 3.6p4.

* Reconstruct sample init files.
* RC-style start script.
* Auto-registration of Kana conversion.
* Abolish fuzokugo.cld.
* More key symbols can be configured with Lisp.
* Server returns more appropriate values at abort.
* TeX document improvements.
* And many bug fixes.

2) Make Canuum use Canna's common make files.  From Osamu Oishi in PR 22244.