[GearVR | IL2CPP] Strip engine code pulls out VR module even though Virtual reality is enabled.

1. How we can reproduce it using the example you attached
1) Note that the settings are as follows
- Scritping backend = IL2CPP
- Strip Engine Code is checked
- Virtual reality mode is enabled
- Oculus is the preferred SDK
2) Deploy to a GearVR enabled device
3) Observe the app launches in 2D mode (this is the bug)

Notes:
- Unchecking strip engine code fixes the problem
- Adding a script that references a piece of th VRModule fixes that problem I.e. XRDevice.model
- Switching to Mono backend fixes the problem

Final note,

I consider this fairly low on the USER pain scale as most VR developers are going to have at least 1 call to a XRModule scripting API . That being said, it is a bug and we should fix it.