Merge SqlDelegatedTransaction (dotnet#2861)

Author: edwardneal

src/Microsoft.Data.SqlClient/netcore/src/Microsoft.Data.SqlClient.csproj

@@ -434,6 +434,9 @@
     <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\SqlDataAdapter.cs">
       <Link>Microsoft\Data\SqlClient\SqlDataAdapter.cs</Link>
     </Compile>
+    <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\SqlDelegatedTransaction.cs">
+      <Link>Microsoft\Data\SqlClient\SqlDelegatedTransaction.cs</Link>
+    </Compile>
     <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\SqlDependency.cs">
       <Link>Microsoft\Data\SqlClient\SqlDependency.cs</Link>
     </Compile>
@@ -650,8 +653,6 @@
     <Compile Include="Microsoft\Data\SqlClient\SqlConnectionHelper.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlDataReader.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlDbColumn.cs" />
-    <Compile Include="Microsoft\Data\SqlClient\SqlDelegatedTransaction.cs" />
-    <Compile Include="Microsoft\Data\SqlClient\SqlDelegatedTransaction.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlDiagnosticListener.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlInternalConnectionTds.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlTransaction.cs" />