Add version.h to SRCFILES.

This is needed for deb target to work.

Change-Id: I726557b796bcf7d2a8a714b154fdfb5c10cda16b
Reviewed-on: https://chromium-review.googlesource.com/999330
Reviewed-by: David Reveman <reveman@chromium.org>
Tested-by: David Reveman <reveman@chromium.org>