.mailmap: add an alias for Bruce Cherniak

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index aa67d3b..5d2a1ce 100644
--- a/.mailmap
+++ b/.mailmap
@@ -98,6 +98,8 @@
 Brian Paul <brianp@vmware.com> root <root@nostromo.localnet.net>
 Brian Paul <brianp@vmware.com> root <root@i965.localnet.net>
 
+Bruce Cherniak <bruce.cherniak@intel.com>
+
 Bruce Merry <bmerry@users.sourceforge.net> <bmerry@gmail.com>
 
 Carl-Philip Hänsch <cphaensch@googlemail.com> Carl-Philip Haensch <s3734770@mail.zih.tu-dresden.de>