make build=lucid fails if there is an uncommitted change in the tree
because '-dirty' is appended to version strings, which causes the image
to exceed the flash size limit.
BUG=chromium:654549
BRANCH=none
TEST=make buildall -j
Change-Id: Ie4a7b4c7dc70846108aed953215f79dc30a10fca
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/396617
Reviewed-by: Randall Spangler <rspangler@chromium.org>