gdiplus: Add test cases for GdipDrawCurve

[Andrew Eikum]

Tested on WinXP Professional SP3 and Win7 Ultimate RC1, all pass.

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 dlls/gdiplus/tests/graphics.c |   64 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 64 insertions(+), 0 deletions(-)
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