Update to 9.x about ctng-compilers-feedstock HOT 8 CLOSED

We do not use crosstool-ng on osx.

We keep separate builds of just gfortran here since we don't need all of gcc

https://github.com/conda-forge/gfortran_osx-64-feedstock
https://github.com/conda-forge/gfortran_impl_osx-64-feedstock

These need to be updated to 9 or 7.5 or w/e.

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That's just for libgcc and libstdcxx. To get a full gcc build, we need to update https://github.com/conda-forge/crosstool-ng-feedstock/blob/master/recipe/meta.yaml to a recent version of crosstool-ng and port the patches in the continuum org's fork of crosstool-ng.

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We'd also want to bump gfortran on osx at the same time.

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@timsnyder If you want to work on this, lots of help is welcome!

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OK. @bdutro-sv is working on this with me.

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@mingwandroid, any chance you've looked at updating crosstool-ng that we should leverage?

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cc @brianv0 for viz

Also see this documentation: https://conda-forge.org/docs/maintainer/infrastructure.html#compilers-and-runtimes

I think we are acting in a way that is consistent with our stated principles. ;)

This will be the comp9 stack. One issue is how much we want to break environments with defaults. I forget the exact details, but I think the gfortran changes will need rebuilds, but not the other ones?

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@beckermr it looks like crosstool-ng dropped support for OS X: https://crosstool-ng.github.io/2019/04/13/release-1.24.0.html

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