Workaround for building on Qt version lower than 5.4.0.
Workaround for building on Qt version lower than 5.4.0.

shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,codarrenvelvindron/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,shinnok/tarsnap-gui,shinnok/tarsnap-gui,shinnok/tarsnap-gui,shinnok/tarsnap-gui,codarrenvelvindron/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui