wined3d: Use higher precision to convert floats into text.

[Vitaliy Margolen]

Fixes bug 10580 and probably some others.
Thanks Stefan for the hint.
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 dlls/wined3d/arb_program_shader.c |   12 ++++++------
 dlls/wined3d/glsl_shader.c        |   11 ++++++-----
 2 files changed, 12 insertions(+), 11 deletions(-)
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