download more packages for diffs.

build/ApiDiff.props

@@ -8,7 +8,8 @@
       <PackageDownload Include="Avalonia" Version="[$(ApiContractPackageVersion)]" />
       <PackageDownload Include="Avalonia.Desktop" Version="[$(ApiContractPackageVersion)]" />
       <PackageDownload Include="Avalonia.Skia" Version="[$(ApiContractPackageVersion)]" />
-      <PackageDownload Include="Avalonia.Remote.Protocol" Version="[$(ApiContractPackageVersion)]" />      
+      <PackageDownload Include="Avalonia.Remote.Protocol" Version="[$(ApiContractPackageVersion)]" />
+      <PackageDownload Include="Avalonia.LinuxFramebuffer" Version="[$(ApiContractPackageVersion)]" /> 
       <PackageReference Include="Microsoft.DotNet.ApiCompat" Version="5.0.0-beta.20364.3" PrivateAssets="All" />
     <ResolvedMatchingContract Include="$(NuGetPackageRoot)\$(NugetPackageName.ToLower())\$(ApiContractPackageVersion)\lib\$(TargetFramework)\$(AssemblyName).dll" />
     </ItemGroup>