Do not convert email addresses with idn_to_ascii if INTL_IDNA_VARIANT_UTS46 is undefined.
Fixes https://github.com/nextcloud/server/issues/8387 . Signed-off-by: Jared Boone <jared.boone@gmail.com>
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Fixes https://github.com/nextcloud/server/issues/8387 . Signed-off-by: Jared Boone <jared.boone@gmail.com>