gdi32: Use a modified version of MulDiv to match native behaviour.

[Huw Davies]

---
 dlls/gdi32/metafile.c       |   46 ++++++++++++++++++-------
 dlls/gdi32/tests/metafile.c |   79 ++++++++++++++++++++++++++++++++-----------
 2 files changed, 92 insertions(+), 33 deletions(-)
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