user32: handle %I64 format in user32.wsprintf* (try 3)

[Dan Kegel]

On Sun, Jul 17, 2011 at 12:51 PM, Dan Kegel <dank at kegel.com> wrote:
> From the 'keeping AF happy' department.
> For http://bugs.winehq.org/show_bug.cgi?id=27818
> Passes winetestbot.

Changes since try1:
- added wide char test cases
- tidied up, fixed thinko that broke one wide char test

Changes since second try:
- don't use LL constants
- don't use printf("%lld"...), borrow lltoa implementation from msvcrt/printf.h
- don't partially implement %I32 formats
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