gdi32: Optimise StretchBlt for the case where no stretching is being done and the whole image is being set.

[Robert Shearman]

In this case, we can just call SetDIBits which is likely to be a lot faster.
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  dlls/gdi32/dib.c |  118 
++++++++++++++++++++++++++++++++++--------------------
  1 files changed, 75 insertions(+), 43 deletions(-)
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