[Take 2] winex11.drv: Fix buffer overflow bug in X11DRV_KeyEvent() and X11DRV_ToUnicodeEx()

[Muneyuki Noguchi]

Changes from the previous patch:
- Add a new variable STRSIZE.
- Use HeapAlloc() and HeapFree() instead of malloc() and free().
- Return from a function when (re)allocation failed.

-- 
Muneyuki Noguchi
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