Rollup merge of rust-lang#156128 - DanielEScherzer:gg-mailmap, r=GuillaumeGomez

.mailmap: prefer matching just based on commit emails

So that commits under different names are still caught

Author: JonathanBrouwer

.mailmap

@@ -259,11 +259,9 @@ Gregor Peach <gregorpeach@gmail.com>
 Grzegorz Bartoszek <grzegorz.bartoszek@thaumatec.com>
 Guanqun Lu <guanqun.lu@gmail.com>
 Guillaume Gomez <contact@guillaume-gomez.fr>
-Guillaume Gomez <contact@guillaume-gomez.fr> Guillaume Gomez <guillaume1.gomez@gmail.com>
-Guillaume Gomez <contact@guillaume-gomez.fr> ggomez <guillaume1.gomez@gmail.com>
-Guillaume Gomez <contact@guillaume-gomez.fr> ggomez <ggomez@ggo.ifr.lan>
-Guillaume Gomez <contact@guillaume-gomez.fr> Guillaume Gomez <ggomez@ggo.ifr.lan>
-Guillaume Gomez <contact@guillaume-gomez.fr> Guillaume Gomez <guillaume.gomez@huawei.com>
+Guillaume Gomez <contact@guillaume-gomez.fr> <guillaume1.gomez@gmail.com>
+Guillaume Gomez <contact@guillaume-gomez.fr> <ggomez@ggo.ifr.lan>
+Guillaume Gomez <contact@guillaume-gomez.fr> <guillaume.gomez@huawei.com>
 gnzlbg <gonzalobg88@gmail.com> <gnzlbg@users.noreply.github.com>
 hamidreza kalbasi <hamidrezakalbasi@protonmail.com>
 Hanna Kruppe <hanna.kruppe@gmail.com> <robin.kruppe@gmail.com>