[Boot2Qt] Hellocube example crashes on Wayland platform

The hellocube example is crashing when running wayland on Jetson TX2 with Boot2Qt 5.15.15. 

It looks like the crashing might be related in the upgrade of egl-wayland from 1.1.3 to
1.1.8. More specifically the problems started with commit
2eb4628d64a8297fb4c08aa796fdf33ff54a670f in egl-wayland.

To reproduce the issue:

1. Install Boot2Qt image on Jetson TX2 Devboard.
2. Compile example "minimal-qml" and "hellocube" using the boot2qt toolchain.
3. Stop qtlauncher
4. Start minimal-qml (XDG_RUNTIME_DIR set)
5. Start 10 instances of hellocube with: (XDG_RUNTIME_DIR set) QT_QPA_PLATFORM=wayland-egl
6. Wait.
   Typically one of the hellocube application will crash within 10-15 minutes. Occacionally the compositor will also crash. Sometimes it can take more time to crash.