Bug#650601: please update ben file

[Gianfranco Costamagna <costamagnagianfranco@yahoo.it>]

Hi the new libpng16 is now in new queue, and this made me think about the ben file.

Affected: .depends ~ /libpng1/
Good: .depends ~ /libpng16/
Bad: .depends ~ /libpng12-0/

this seems bad.

I would do:

title = "libpng16";
is_affected = .build-depends ~ /libpng12-dev/ | .build-depends ~ /libpng3-dev/ | .build-depends ~ /libpng-dev/;
is_bad = .depends ~ /libpng3/ | .depends ~ /libpng12-0/;
is_good = .depends ~ /libpng16-16/;

I'm not 100% sure about it, but at least libpng16 looks wrong to me, and if we want to deprecate libpng3 and libpng12 we
need to have both in the tracker.

thanks,

Gianfranco