[SDL] preedit XIM support

[MATSUU Takuto]

hi.

Alissa Sabre had released XIM patch for SDL 1.2.11. It has no changes
in ABI. I can input Japanese characters on slviewer (Second Life
Viewer).

XIM patch for SDL 1.2.11
http://secondlife-wiki.main.jp/modules/pukiwiki/index.php?plugin=attach&pcmd=info&file=SDL-patch.zip&refer=%5B%5B%C6%FC%CB%DC%B8%EC%A5%C1%A5%E3%A5%C3%A5%C8%5D%5D

HOWTO input Japanese on slviewer
http://secondlife-wiki.main.jp/modules/pukiwiki/?%C6%FC%CB%DC%B8%EC%A5%C1%A5%E3%A5%C3%A5%C8

HOWTO input Japanese on slviewer(google translate)
http://translate.google.com/translate?u=http%3A%2F%2Fsecondlife-wiki.main.jp%2Fmodules%2Fpukiwiki%2F%3F%25C6%25FC%25CB%25DC%25B8%25EC%25A5%25C1%25A5%25E3%25A5%25C3%25A5%25C8&langpair=ja%7Cen&hl=en&ie=UTF-8&oe=UTF-8

thanks,
matsuu