Fixed include condition for linux skia binaries

build/SkiaSharp.props

@@ -1,6 +1,6 @@
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <PackageReference Include="SkiaSharp" Version="1.57.1" />
-    <PackageReference Condition="$(TargetFramework.Trim('.').ToLower().StartsWith('netframework'))" Include="Avalonia.Skia.Linux.Natives" Version="1.57.1.3" />
+    <PackageReference Condition="'$(IncludeLinuxSkia)' == 'true'" Include="Avalonia.Skia.Linux.Natives" Version="1.57.1.3" />
   </ItemGroup>
 </Project>

src/Skia/Avalonia.Skia.Desktop.NetStandard/Avalonia.Skia.Desktop.NetStandard.csproj

@@ -5,6 +5,7 @@
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
     <RootNamespace>Avalonia.Skia.Desktop</RootNamespace>
     <AssemblyName>Avalonia.Skia.Desktop</AssemblyName>
+    <IncludeLinuxSkia>true</IncludeLinuxSkia>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
     <DebugSymbols>true</DebugSymbols>
@@ -42,4 +43,4 @@
   <Import Project="..\..\..\build\SkiaSharp.props" />
   <Import Project="..\Avalonia.Skia\Avalonia.Skia.projitems" Label="Shared" />
   <Import Project="..\..\Shared\RenderHelpers\RenderHelpers.projitems" Label="Shared" />
-</Project>
+</Project>

src/Skia/Avalonia.Skia.Desktop/Avalonia.Skia.Desktop.csproj

@@ -54,6 +54,9 @@
     <ErrorReport>prompt</ErrorReport>
     <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
+  <PropertyGroup>
+    <IncludeLinuxSkia>true</IncludeLinuxSkia>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="System.Core" />
@@ -107,4 +110,4 @@
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="..\..\..\build\SkiaSharp.props" />
   <Import Project="$(MSBuildThisFileDirectory)..\..\Shared\nuget.workaround.targets" />
-</Project>
+</Project>