libvpx: Pull from upstream

source/libvpx/.mailmap

Index: source/libvpx/.mailmap
===================================================================
--- source/libvpx/.mailmap	(revision 240950)
+++ source/libvpx/.mailmap	(working copy)
@@ -1,8 +1,18 @@
 Adrian Grange <agrange@google.com>
+Alexis Ballier <aballier@gentoo.org> <alexis.ballier@gmail.com>
+Hangyu Kuang <hkuang@google.com>
+Jim Bankoski <jimbankoski@google.com>
+John Koleszar <jkoleszar@google.com>
 Johann Koenig <johannkoenig@google.com>
+Johann Koenig <johannkoenig@google.com> <johann.koenig@duck.com>
+Johann Koenig <johannkoenig@google.com> <johannkoenig@dhcp-172-19-7-52.mtv.corp.google.com>
+Pascal Massimino <pascal.massimino@gmail.com>
+Sami Pietilä <samipietila@google.com>
 Tero Rintaluoma <teror@google.com> <tero.rintaluoma@on2.com>
+Timothy B. Terriberry <tterribe@xiph.org> Tim Terriberry <tterriberry@mozilla.com>
 Tom Finegan <tomfinegan@google.com>
 Ralph Giles <giles@xiph.org> <giles@entropywave.com>
 Ralph Giles <giles@xiph.org> <giles@mozilla.com>
 Alpha Lam <hclam@google.com> <hclam@chromium.org>
 Deb Mukherjee <debargha@google.com>
+Yaowu Xu <yaowu@google.com> <yaowu@xuyaowu.com>