QNX: hardcode on-demand SSL root cert loading

The c_rehash'ed symlinks are always there on QNX, so no need to check
at every app start for the feature. This saves ~ 17ms at each app
start.

Task-number: QTBUG-32549
Change-Id: Ia9df60aba9d1bd70868b7004b847867a2128f600
Reviewed-by: Andreas Holzammer <andreas.holzammer@kdab.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>