gdiplus: Fix a typo in struct GpAdjustableArrowCap

[Ken Thomases]

On Jun 3, 2016, at 10:12 AM, Andrey Gusev <andrey.goosev at gmail.com> wrote:
> 
> diff --git a/dlls/gdiplus/gdiplus_private.h b/dlls/gdiplus/gdiplus_private.h
> index 10092f1..9b29d88 100644
> --- a/dlls/gdiplus/gdiplus_private.h
> +++ b/dlls/gdiplus/gdiplus_private.h
> @@ -314,7 +314,7 @@ struct GpCustomLineCap{
>      REAL scale;
>  };
>  
> -struct GpAdustableArrowCap{
> +struct GpAdjustableArrowCap{
>      GpCustomLineCap cap;
>  };
>  

Nothing uses this struct, which is evident by the fact that there are no other changes necessary along with the above change.  So, why is this here, at all?  Shouldn't it just be removed?

-Ken