If we check the timestamp of make_dep_file itself, we rebuild always for buildbots since they always re-bootstrap jhm and make_dep_file.

For now work around this by not timestamping make_dep_file (Do g++ instead). Less than ideal but functional. In the future we will ideally only re-bootstrap as necessary, but that requires considerably more engineering effort.
Merge pull request #187 from cmaloney/jhm-make-dep-file-timestamp

If we check the timestamp of make_dep_file itself, we rebuild always for...