build: add VERSION to the osx app bundle
build: add VERSION to the osx app bundle

Following tips from:
    https://gist.github.com/grassator/11405930

Unfortunately I have no clue why this isn't handled automagically by qmake.

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