[Take 5] winex11.drv: Fix a buffer overflow bug in X11DRV_KeyEvent() and X11DRV_ToUnicodeEx()

[Muneyuki Noguchi]

winex11.drv: Fix a buffer overflow bug in X11DRV_KeyEvent() and
X11DRV_ToUnicodeEx()

Currently, Wine users can't input and enter more than 8 multi-byte
characters with a input method, such as SCIM and uim (Bug #11281 and
Bug #9838). This makes CJK users very frustrated and is a serious bug.
This bug can't be reproduced when users are inputting only single-byte
characters. The attached patch fixes this bug.

CJK input many issues
http://bugs.winehq.org/show_bug.cgi?id=11281
Input Method's output overruns the buffer of wine keyboard input
http://bugs.winehq.org/show_bug.cgi?id=9838

A similar patch is sent to wine-patches by Kusanagi Kouichi, but
rejected his second patch silently. To make the issue clear, unlike
his patch, my patch fixes only buffer overflow bugs.

winex11.drv: Handle arbitrary length composed input. [take 2]
http://www.winehq.org/pipermail/wine-patches/2008-March/051858.html

Again, this is a serious bug for CJK users.
-- 
Muneyuki Noguchi
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