mailmap: add an entry for Phillip Wood

While all my commits appear under the same address, other addresses
appear in some commit trailers. Map those addresses to the canonical
one.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: phillipwood

.mailmap

@@ -226,6 +226,8 @@ Philip Jägenstedt <philip@foolip.org> <philip.jagenstedt@gmail.com>
 Philip Oakley <philipoakley@iee.email> <philipoakley@iee.org> # secondary <philipoakley@dunelm.org.uk>
 Philipp A. Hartmann <pah@qo.cx> <ph@sorgh.de>
 Philippe Bruhat <book@cpan.org>
+Phillip Wood <phillip.wood@dunelm.org.uk> <phillip.wood123@gmail.com>
+Phillip Wood <phillip.wood@dunelm.org.uk> <phillip.wood@talktalk.net>
 Ralf Thielow <ralf.thielow@gmail.com> <ralf.thielow@googlemail.com>
 Ramsay Jones <ramsay@ramsayjones.plus.com> <ramsay@ramsay1.demon.co.uk>
 Ramkumar Ramachandra <r@artagnon.com> <artagnon@gmail.com>