gdiplus: GdipLoadImageFromStream should use well-known pixel format constants when possible

[Andrey Turkin]

PixelFormat is defined as INT in C/C++, and consist of several
bit-shifted field; however it is declared as enumeration with 14 possible
values, thus GDI+ function must use those predefined values if possible.
This patch make GdipLoadImageFromStream do this. Should make Eclipse 3.4
happier and fix bug 14196

---
 dlls/gdiplus/image.c |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)


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