Build&Run for Phone 8.1 sdk fails to load native plugins. It throws an error that can be seen if using a development build.

Deploying the same solution through Visual Studio works fine.

To reproduce:
1. Open attached project
2. Build & Run for Windows Store with Phone 8.1 sdk development build
3. When deployed, notice the errors in the phone:
Exception: Unable to load DLL 'WP81NativePlugin.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
Type: System.DllNotFoundException
Module: Assembly-CSharp
InnerException: <No Data>
AdditionalInfo:<No Data>
at Useit.GetHelloWorldString()
at Useit.Start()
at Useit.$Invoke1(Int64 instance, Int64* args)
at UnityEngine.Internal.$MethodUtility.InvokeMethod(Int64 instance, Int64* args, IntPtr method)

If you deploy the same solution via Visual Studio (debug mode) - everything works fine

This is caused by the fact that the plugin was built with a debug configuration. It can be solved by building a release configuration of the plugin.