Move away from setting HOST in user environments

[timsnyder]

Solution to issue cannot be found in the documentation.

• I checked the documentation.

Issue

Setting BUILD and HOST during conda-build makes complete sense when you're potentially cross-compiling and you have them handy. However, when you set HOST in a user environment it definitely conflicts with at least the %m formatting string in ZSH PS1 prompts.

Refresh the changes made in AnacondaRecipes/aggregate#172 so that they can be merged.

I'll do this. I've just been away for a couple of years...

Installed packages

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Environment info

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