Tomas Hozza authored Sep 23, 2015 and Ondřej Surý committed Mar 17, 2018

Added new configure option:
--with-libidn - to enable IDN using GNU libidn

Renamed configure option:
--with-idn to --with-idnkit to make the option usage more clear

idnkit and libidn support can not be used at the same time.

Signed-off-by: Tomas Hozza <thozza@redhat.com>