Since commit d18692c libxml2 is linked against iconv. Now ices needs
access to iconv as well. Without it the build fails.
checking for ftime... yes
checking for XML configuration
checking for xml2-config... /builder/shared-workdir/build/sdk/staging_dir/target-aarch64_generic_musl/host/bin/xml2-config
checking for xmlParseFile... no
configure: error: Unable to link with libxml
Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>