gdiplus: Add a stub for GdipSetLinePresetBlend.

dlls/gdiplus/brush.c

@@ -675,3 +675,14 @@ GpStatus WINGDIPAPI GdipSetLineLinearBlend(GpLineGradient *brush, REAL focus,
 
     return NotImplemented;
 }
+
+GpStatus WINGDIPAPI GdipSetLinePresetBlend(GpLineGradient *brush,
+    GDIPCONST ARGB *blend, GDIPCONST REAL* positions, INT count)
+{
+    static int calls;
+
+    if(!(calls++))
+        FIXME("not implemented\n");
+
+    return NotImplemented;
+}

dlls/gdiplus/gdiplus.spec

@@ -539,7 +539,7 @@
 @ stdcall GdipSetLineColors(ptr long long)
 @ stdcall GdipSetLineGammaCorrection(ptr long)
 @ stdcall GdipSetLineLinearBlend(ptr long long)
-@ stub GdipSetLinePresetBlend
+@ stdcall GdipSetLinePresetBlend(ptr ptr ptr long)
 @ stdcall GdipSetLineSigmaBlend(ptr long long)
 @ stub GdipSetLineTransform
 @ stdcall GdipSetLineWrapMode(ptr long)