Update .mailmap entry for Ralph Giles

Change-Id: Ib3d54bfa81720a0b2877837d7149cd12d26e75e4

.mailmap

diff --git a/.mailmap b/.mailmap
index 5052f29..2e1d4a9 100644
--- a/.mailmap
+++ b/.mailmap
@@ -2,3 +2,4 @@
 Johann Koenig <johannkoenig@google.com>
 Tero Rintaluoma <teror@google.com> <tero.rintaluoma@on2.com>
 Tom Finegan <tomfinegan@google.com>
+Ralph Giles <giles@xiph.org> <giles@entropywave.com>