Make sure that createShortcuts() function is not global

With IFW 1.4 the createShortcuts() global function was attached only
to one installer component. Make sure that the function is not global.

Task-number: QTIFW-294
Change-Id: I1d0afa202aa510fe7b525b1cc83619b0cabea005
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
Reviewed-by: Niels Weber <niels.weber@digia.com>