Makefile: adapt to upstream's libftdi handling

BUG=chromium:478356
BRANCH=none
TEST=still builds

Change-Id: Ib8c556a6db3b2f7ebae5732d98702022d618e06b
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/485582
Commit-Ready: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
1 file changed