Update openblas download from anaconda

[mattip]

fixes gh-354 by updating the build_openblas function.

[matthew-brett]

Getting a build failure - ?for PyPy - where it's trying to access https://anaconda.org/multibuild-wheels-staging/openblas-libs/v0.3.10/download/openblas-v0.3.10-manylinux2014_x86_64.tar.gz - that doesn't exist. Actually, I can't see that file at https://anaconda.org/multibuild-wheels-staging/openblas-libs/files - did I miss it? If not, should it exist?

[mattip]

If not, should it exist?

Yes. I will submit a PR to the openblas-lib builder repo.

[mattip]

The v0.3.10 and v0.3.9-452-g349b722d manylinux2014 tarballs are now up. Note the latter is actually a post-v0.3.10 version, but is labelled like that due to ... quirks. See MacPython/openblas-libs#4. I can't restart the failed build, @matthew-brett can you?

[matthew-brett]

Thanks Matti. Restarted.

[MarkWieczorek]

just curious if this PR finished... :)

[matthew-brett]

Matti - OK to merge? Will you do the honors?