Change libvp8 library patch in makefile
Change libvp8 library patch in makefile

It's caused by recent file structure changes in vp8

TBR=ronghua,kma
BUG=
TEST=local build
Review URL: https://webrtc-codereview.appspot.com/707004

git-svn-id: 9b397c5dfe384c04b1b200d5305b653241000171@2528 4adac7df-926f-26a2-2b94-8c16560cd09d

lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override