gdiplus: Add a stub for GdipSetLineColors.

dlls/gdiplus/brush.c

@@ -653,3 +653,14 @@ GpStatus WINGDIPAPI GdipSetTextureTransform(GpTexture *texture,
 
     return Ok;
 }
+
+GpStatus WINGDIPAPI GdipSetLineColors(GpLineGradient *brush, ARGB color1,
+    ARGB color2)
+{
+    static int calls;
+
+    if(!(calls++))
+        FIXME("not implemented\n");
+
+    return NotImplemented;
+}

dlls/gdiplus/gdiplus.spec

@@ -536,7 +536,7 @@
 @ stdcall GdipSetInfinite(ptr)
 @ stdcall GdipSetInterpolationMode(ptr long)
 @ stdcall GdipSetLineBlend(ptr ptr ptr long)
-@ stub GdipSetLineColors
+@ stdcall GdipSetLineColors(ptr long long)
 @ stdcall GdipSetLineGammaCorrection(ptr long)
 @ stub GdipSetLineLinearBlend
 @ stub GdipSetLinePresetBlend