package: add gutenprint

Gutenprint, formerly named Gimp-Print, is a suite of printer
drivers that may be used with most common UNIX print spooling
systems, including CUPS, lpr, LPRng, or others

[Peter: needs host-pkgconf]
Signed-off-by: Olivier Schonken <olivier.schonken@gmail.com>
[yann.morin.1998@free.fr: needs libiconv, cleanup]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>