Fixed nuget deps

build/System.Drawing.Common.props

@@ -0,0 +1,5 @@
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <PackageReference Include="System.Drawing.Common" Version="4.5.0-preview1-25914-04" />
+  </ItemGroup>
+</Project>

packages.cake

@@ -370,10 +370,10 @@ public class Packages
             new NuGetPackSettings()
             {
                 Id = "Avalonia.Win32",
-                Dependencies = new []
+                Dependencies = new DependencyBuilder(this)
                 {
                     new NuSpecDependency() { Id = "Avalonia", Version = parameters.Version }
-                },
+                }.Deps(new string[]{null}, "System.Drawing.Common"),
                 Files = new []
                 {
                     new NuSpecContent { Source = "Avalonia.Win32/bin/" + parameters.DirSuffix + "/netstandard2.0/Avalonia.Win32.dll", Target = "lib/netstandard2.0" }

src/OSX/Avalonia.MonoMac/Avalonia.MonoMac.csproj

@@ -8,9 +8,6 @@
     <Compile Include="..\..\Shared\SharedAssemblyInfo.cs" Link="SharedAssemblyInfo.cs" />
     <Compile Include="..\..\Shared\WindowResizeDragHelper.cs" Link="WindowResizeDragHelper.cs" />
   </ItemGroup>
-  <ItemGroup>
-    <PackageReference Include="MonoMac.NetStandard" Version="0.0.3" />
-  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\Avalonia.Animation\Avalonia.Animation.csproj" />
     <ProjectReference Include="..\..\Avalonia.Base\Avalonia.Base.csproj" />

src/Windows/Avalonia.Win32/Avalonia.Win32.csproj

@@ -13,7 +13,5 @@
     <ProjectReference Include="..\..\Avalonia.Styling\Avalonia.Styling.csproj" />
     <ProjectReference Include="..\..\Avalonia.Visuals\Avalonia.Visuals.csproj" />
   </ItemGroup>
-  <ItemGroup>
-    <PackageReference Include="System.Drawing.Common" Version="4.5.0-preview1-25914-04" />
-  </ItemGroup>
-</Project>
+  <Import Project="$(MSBuildThisFileDirectory)\..\..\..\build\System.Drawing.Common.props" />
+</Project>