Based on patch provided by Ryo ONODERA in PR 42416 (include user-destdir support).
While here set LICENSE=gnu-gpl-v2.
* 2.06.3 -> 2.06.4
- close IM by Shift-Space even if NumLock or CapsLock.
- fix skkinput.ja.man install path
* Improve IPv6 support.
* Make XIM, Ximp start keys configurable.
* Keep input modes across conversations. (History functions.)
* Convert "oh" as "oo".
* Support "Off The Spot" style.
And tons of bug fixes.