perlPackages: add dependencies needed by 'shutter' application

shutter is a screenshot and annotation GUI tool, coming to Nix soon.
This commit adds its needed perl dependencies:

  Gnome2, Gnome2Canvas, Gnome2VFS, Gnome2Wnck, GooCanvas,
  Gtk2AppIndicator, Gtk2ImageView, Gtk2Unique, ProcSimple

All expressions are created with nix-generate-from-cpan and manual
tweaks to (propagated)buildInputs and meta.license.