[2/2] gdiplus: fix GdipCreateBitmapFromHBITMAP flipping images vertically

[Vincent Povirk]

GdipCreateBitmapFromHBITMAP currently assumes that all bitmaps are top-down, even though a positive height (which it also assumes) signals a bottom-up DIB. The net result is that GdipCreateBitmapFromHBITMAP flips images vertically.

To properly convert a bottom-up DIB using GdipCreateBitmapFromScan0, one must use a negative stride and adjust the scan0 pointer to point to the top-most scanline.

If the bitmap isn't a DIB section, bm.bmBits will be NULL, and adjusting the pointer is a bad idea. What we should do in that case is use a different function to read the bitmap. Instead of doing that, I've skipped the adjustment and added a FIXME.
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