It will now ignore warnings in normal builds, and only them
this change is because we can't control the timestamps on the
`configure` and `configure.ac` files on `git clone` or
`git checkout`. The `git` program may write one file before
another, and not necessarily in any order we would like.
Since we can't fix that, we just suppress the warnings.
Alan T. DeKok@2019-10-08T22:20:04Z