wchar dependency on IDN option has been added with commit
126a2e75f5 because of libintl
However libintl dependency has been dropped with commit
bbcbed1829 so remove unneeded wchar
dependency
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>