wined3d: Ensure wined3d_ftoa() exponent is 2 digits on Windows.

[Jonathan Liu]

This fixes a regression introduced by commit
12f16f2127ffce9a05eedf008c3aa3732751a7e3 where the returned exponent
is 3 digits on Windows instead of 2 digits which results in rendering
errors. The printf implementation in the Microsoft Visual C runtime
uses three digits for the exponent by default.

This also handles the situtation where printf uses two-digit exponents
after _set_output_format(_TWO_DIGIT_EXPONENT) is called.
---
  dlls/wined3d/utils.c | 14 ++++++++++++++
  1 file changed, 14 insertions(+)


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