Merge branch 'mt/send-email-cc-match-fix'

Logic used by git-send-email to suppress cc mishandled names that
need RFC2047 quoting.

* mt/send-email-cc-match-fix:
send-email: sanitize author when writing From line
send-email: add test for duplicate utf8 name

diff --cc git-send-email.perl
Simple merge

diff --cc t/t9001-send-email.sh
Simple merge