Remove dependency on ninja-build

Change-Id: Ib13212ec6a2cebbdda8ab1220b71fdaa39c91927
Reviewed-on: https://weave-review.googlesource.com/1631
Reviewed-by: Vitaly Buka <vitalybuka@google.com>
Reviewed-by: Alex Vakulenko <avakulenko@google.com>