Tell il-repack to get assembly attributes from NHibernate.dll

There is an issue in il-repack 2.10: it tries to "clean up" assembly attributes even when it wasn't asked to do so.

Author: hazzik

src/NHibernate/NHibernate.csproj

@@ -1814,6 +1814,6 @@
   </Target>
   -->
   <Target Name="AfterBuild" Condition=" '$(Configuration)' == 'Release' ">
-    <Exec Command="$(SolutionDir)..\Tools\ilrepack\ilrepack.exe /verbose /t:library /targetplatform:v4 /keyfile:$(AssemblyOriginatorKeyFile) /internalize:internalize.exclude /out:$(OutputPath)\NHibernate.dll $(IntermediateOutputPath)\NHibernate.dll $(OutputPath)\Remotion.Linq.dll $(OutputPath)\Antlr3.Runtime.dll" />
+    <Exec Command="$(SolutionDir)..\Tools\ilrepack\ilrepack.exe /verbose /t:library /targetplatform:v4 /keyfile:$(AssemblyOriginatorKeyFile) /internalize:internalize.exclude /attr:$(IntermediateOutputPath)\NHibernate.dll /out:$(OutputPath)\NHibernate.dll $(IntermediateOutputPath)\NHibernate.dll $(OutputPath)\Remotion.Linq.dll $(OutputPath)\Antlr3.Runtime.dll" />
   </Target>
 </Project>