GitLab

Prefer multibuild library locations over the defaults.
Sometimes multibuild would use an older version
over it's own.

* [library_builders] use brew to install openblas

Yields better performance on OSX

* [tst:library_builders] add openblas

* [tst:library_builders] update homebrew

* fix bash

* [library_builders] force openblas link

* ENH: libraries: add a build_github function

* FIX: use name stamp

* MAINT: remove noop

* [tst:library_builders] add build_github