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Osx reliability improvements

Updated arb to 2.12.0

MRG: Lift branch limitations

Allow users to test from topic branches.

* Don't update homebrew

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

delocate-listdeps is not required and can take a several minutes for
heavyweight wheels.

* Add config.pre to override envvars used in `library_builders.sh`
Fixes part 2 of https://github.com/matthew-brett/multibuild/issues/116

* rename config_pre.sh to env_vars.sh as suggested

Add notes clarifying what to check out
Addresses gh-38.

* install.ps1 causes https://github.com/appveyor/ci/issues/2023 in Miniconda 3.6

#111 dropped support

It appears that is_function actually
calls the function (debugged). Why
that happens is a mystery to me, but
this should ensure that the spinner
runs as it is supposed to rather than
waiting until pre_build is complete.

See https://github.com/travis-ci/travis-ci/issues/8703#issuecomment-348866918

* Allow to specify a custom $CONFIG_PATH

* need to also pass  to the docker container

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.

* Revert "Revert "[osx_steps] export cppflags""

This reverts commit 7956064f.

* Try using LIBRARY_PATH instead of LDFLAGS