GenerateResource in UWP project Error when using stream resources in the resx files

[UWP-Win8.zip](https://github.com/Microsoft/msbuild/files/1106537/UWP-Win8.zip)

When having UWP project which is reference a C# portable library that is using stream resources in the resx file and then compiling the UWP project will get the following error

```
Error The "GenerateResource" task failed unexpectedly.
System.InvalidOperationException: Item named 'SerializedStream' of type 'System.IO.UnmanagedMemoryStream' cannot be added to the resource file because it is not serializable.
at Microsoft.Build.Tasks.ProcessResourceFiles.WriteResources(ReaderInfo reader, IResourceWriter writer)
at Microsoft.Build.Tasks.ProcessResourceFiles.WriteResources(ReaderInfo reader, String filename)
at Microsoft.Build.Tasks.ProcessResourceFiles.ProcessFile(String inFile, String outFileOrDir)
at Microsoft.Build.Tasks.ProcessResourceFiles.Run(TaskLoggingHelper log, ITaskItem[] assemblyFilesList, List`1 inputs, List`1 satelliteInputs, List`1 outputs, Boolean sourcePath, String language, String namespacename, String resourcesNamespace, String filename, String classname, Boolean publicClass, Boolean extractingResWFiles, String resWOutputDirectory)
at Microsoft.Build.Tasks.ProcessResourceFiles.Run(TaskLoggingHelper log, ITaskItem[] assemblyFilesList, List`1 inputs, List`1 satelliteInputs, List`1 outputs, Boolean sourcePath, String language, String namespacename, String resourcesNamespace, String filename, String classname, Boolean publicClass, Boolean extractingResWFiles, String resWOutputDirectory)
at Microsoft.Build.Tasks.GenerateResource.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext() UWP-Win8 C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\AppxPackage\Microsoft.AppXPackage.Targets 1189
```

I didn't notice getting same error if I create a desktop app instead.