WoW crashes in 'wine_cp_mbstowcs' under certain circumstances.

[Tomas Carnecky]

Wine doesn't crash in this function, sorry, it's a bug in pf_vsnprintf()
which causes snprintf() to write beyond the end of the buffer.

I've attached a patch that fixes it for me, but it's probably better not
to create such large buffers on the stack.
Anyone with a better fix?

tom
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