fdo#53252: _toupper is unreliable

<http://msdn.microsoft.com/en-us/library/45119yx3%28v=vs.80%29.aspx> "toupper,
_toupper, towupper, _toupper_l, _towupper_l: Visual Studio 2005" states: "In
order for toupper to give the expected results, __isascii and isupper must both
return nonzero."  But a community comment clarifies: "This is incorrect, and
should refer to '_toupper' (the macro form), not 'toupper'."  (Which makes
sense, as otherwise toupper would violate the C Standard.)

And indeed, at least for some LO built against MSVC 2008 Express on Windows 7,
_toupper('C') = '#' is broken, while toupper('C') = 'C' is good.  (And the
unexpected '#' then causes all sorts of errors in the code.)

Change-Id: Iddaddcaf0cc3ffb30e55b0f410a6cfe9118accc8

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