[Reg 5.7 -> 5.8] referenceexamples/extended doesn't launch on RHEL 7.2

The issue is present on RHEL 7.2 only. Cannot be reproduced on Ubuntu 16.04. It's not reproducing with the 5.7.0 offline installer on RHEL 7.2.

Steps to reproduce:

• Download the latest enterprise offline installer (build number #597)
• build and run the Examples/Qt-5-8/qml/referenceexamples/extended/extended.pro

Expected result:
The application launches and runs

Actual result:
The application doesn't run, and gives an error:
"QQmlComponent: Component is not ready
(qrc:example.qml:50:11: Boy is not a type)"
to the Application output