package/wget: add optional dependency to libiconv

wget has an optional dependency to libiconv:
http://git.savannah.gnu.org/cgit/wget.git/tree/configure.ac#n344

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/wget/wget.mk

@@ -21,6 +21,10 @@ else
 WGET_CONF_OPTS += --without-ssl
 endif
 
+ifeq ($(BR2_PACKAGE_LIBICONV),y)
+WGET_DEPENDENCIES += libiconv
+endif
+
 ifeq ($(BR2_PACKAGE_LIBIDN2),y)
 WGET_CONF_OPTS += --with-libidn
 WGET_DEPENDENCIES += libidn2