Unconverted BP function library does not assign output parameters after function call in a nativized build.

Stub functions generated for unconverted assets as dependencies of nativized assets do not properly handle output parameters (the result is not assigned after the ProcessEvent() call).

Suggested fix is offered in the support thread.

1. Open attached project in UE4 editor.
2. PIE, and notice that '100' is displayed after a short delay.
3. Choose File->Package Project->Windows->Win64 and wait for packaging to finish.
4. Launch the packaged EXE.
5. Notice that '0' is displayed after a short delay.
   Expected result: Output is consistent with PIE in the packaged EXE.