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
(backport of commit 28ff65f4dc67349ff88e4cd161b6bced7e9bf477)

Change-Id: Ibcc2b5fee806d4a885657746516f4682df2bfa29
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>