Change libmtp to include libusb from the right location.

TBR=vandebo
Review URL: https://codereview.chromium.org/11227014

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libmtp@163169 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
2 files changed