GitLab

Since https://github.com/travis-ci/travis-build/commit/52c6b6cc1d537e52c8ae6f0906944d6fcaa3d173, it's no longer needed

It went down, I noticed yesterday.

We can't easily predict what the output directory will be for a Github
release archive.  Get fetch_unpack to tell us.  Add some tests that
won't fail, but at least show us the output.

https://travis-ci.org/matthew-brett/multibuild/jobs/382564348#L2248

Resolution option 2-1 for https://github.com/matthew-brett/multibuild/issues/116

Add libtool, flex, and bison.

flex must be fetched from the released archive, rather
than the GitHub autogenerated source.

The archives directory was not created. I tested this downstream and the fix worked.

Fetch OpenBLAS from wheels.scipy.org rather than building it.

Resolution option 2-1 for https://github.com/matthew-brett/multibuild/issues/116