Changed dependencies:
* src/third_party/lss: https://chromium.googlesource.com/linux-syscall-support.git/+log/63f24c8221..e6527b0cd4

TBR=phoglund@chromium.org
BUG=libyuv:768
TEST=None

Change-Id: Ieecd96f78c841b6defed0105430b2a09168b7b54
Reviewed-on: https://chromium-review.googlesource.com/849258Reviewed-by: Frank Barchard <fbarchard@chromium.org>