Fix NU5118 packing issue

The 'File X is not added because the package already contains file X' warnings appeared
when two target framework were involved

Author: alex-kulakov

Orm/Xtensive.Orm/Xtensive.Orm.csproj

@@ -123,9 +123,9 @@
 
   <Target Name="IncludeWeaverFiles">
     <ItemGroup>
-      <TfmSpecificPackageFile Include="$(BaseOutputPath)tools\weaver\**">
+      <TfmSpecificPackageFile Include="$(BaseOutputPath)tools\weaver\$(TargetFramework)\**">
         <Pack>true</Pack>
-        <PackagePath>tools\weaver\</PackagePath>
+        <PackagePath>tools\weaver\$(TargetFramework)</PackagePath>
       </TfmSpecificPackageFile>
     </ItemGroup>
   </Target>