send-email: rfc2047-quote subject lines with non-ascii characters
We always use 'utf-8' as the encoding, since we currently have no way of getting the information from the user. This also refactors the quoting of recipient names, since both processes can share the rfc2047 quoting code. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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