Revert "Fixing hard-coded libvpx source path."
Revert "Fixing hard-coded libvpx source path."

This reverts commit 1c603646da11971f13d66a75da31ebbb6eff37d9.

TBR=phoglund@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/1137004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@3565 4adac7df-926f-26a2-2b94-8c16560cd09d

ShiftMediaProject/libilbc,mwgoldsmith/libilbc,mwgoldsmith/ilbc,mwgoldsmith/libilbc,TimothyGu/libilbc,mwgoldsmith/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/ilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,mwgoldsmith/ilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/ilbc,TimothyGu/libilbc,mwgoldsmith/libilbc,ShiftMediaProject/libilbc