Bug#792091: game-data-packager: GPD should check installed engine version first

[Alexandre Detiste]

control: severity -1 minor

> A few games (Sfinx, Inherit the earth/German,
> Zork Grand Inquisitor, Zork Nemesis)
> only work with scummvm (>= 1.8.0).
> 
> While this precise release is due soon, GDP should catch
> this error early and not at the 'dpkg -i' stage.
> 
> Tricky: this has to be done by package, not by game,
> as the English version of "Inherit the earth" works
> with older scummvm releases.

Easy part is done, tricky not yet, keeping this bug open;
but lowering severity as only 1 package is impacted
for 1 month or 2 and this is explained in help_text too.