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

* [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

build_simple did not install correctly

Old SWIG cannot compile on Python 3.

Some libraries use 'tar.bz2' instead of 'tar.gz' as source archive format.
This patch allows to pass a fourth argument to `build_simple` function to specify an alternative extension to the default `tar.gz`.

The `untar` function in common_utils.sh, used by `fetch_unpack`, already supports the following archive formats: tar, gz, bz2, zip and xz.

Snappy is a compression/decompression library.

LibLZF is a small compression library. Homepage:
http://oldhome.schmorp.de/marc/liblzf.html

See: https://github.com/MacPython/h5py-wheels/pull/3

Several CVEs have been published against the upstream HDF5 libraries, which are packaged (currently 1.8.13) with the windows version.

CVE-2016-4330
CVE-2016-4331
CVE-2016-4332
CVE-2016-4333

These have been fixed in the current 1.8.18 release.

Hat tip to @teeks99.

Add openjpeg dependencies to openjpeg build recipe.

Remove openjpeg as dependency for tiff (doesn't appear to be found during tiff
build).