Merge pull request #941 from eugbaranov/references

Simplify .NET Framework conditional references

Author: somdoron

src/NetMQ/NetMQ.csproj

@@ -49,17 +49,9 @@
     <PackageReference Include="System.ServiceModel.Primitives" Version="4.4.0" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
-  
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
-    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies.net45" Version="1.0.0" PrivateAssets="All" />
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
-    <Reference Include="System.ServiceModel" />
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net47' ">
-    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies.net47" Version="1.0.0" PrivateAssets="All" />
+  <ItemGroup Condition=" '$(TargetFrameworkIdentifier)' == '.NETFramework' ">
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
     <Reference Include="System.ServiceModel" />
     <Reference Include="System" />