package/gettext-tiny: drop dependency of host-variant on libiconv

package/gettext-tiny: drop dependency of host-variant on libiconv

The host variant of gettext-tiny incorrectly has a dependency on the
target libiconv. Not only this is wrong (a host package cannot use a
target library), but it also causes a circular dependencies:
host-gettext-tiny is needed as part of the toolchain build in some
configurations, and all target packages depend on the toolchain being
available.

For host packages, we assume that iconv functionnality is provided by
the host system, so there is no host-libiconv package.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Reviewed-by: Alexey Brodkin <abrokdin@synopsys.com>
[Thomas: rework commit log]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>