ICC chokes on the way, callbacks are registered for the winrt backend,
so it should be disabled when ICC is used to build QtConnectivity.

Task-number: QTBUG-68026
Change-Id: I6f8f0b031a97afe7ebecc5cdf78d4fe4d1aac2b4
Reviewed-by: Alexander Shevchenko <sav_ix@ukr.net>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>