strv_extend_strv_utf8_only() uses a temporary buffer to make the implementation conscise. Otherwise we'd have to rewrite all of strv_extend_strv() which didn't seem worth the trouble for this one use outside of a hot path. If the data is not serializable, we just pretend it doesn't exists. This fixes #16683 and https://bugs.gentoo.org/735072 in a second way.
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