pkgs: update to libgettext8-shlibs 0.18.3.1-2

This adds a versioned (b)dep on libiconv (>= 1.14-5)
pkgs: update to tar 1.26-3

This adds a versioned (b)dep on libiconv (>= 1.14-5)
pkgs: update to dpkg 1.10.21-1238

This adds a versioned (b)dep on libiconv (>= 1.14-5)