c-ares: reduce build dependency tree

[Bo98]

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Ninja pulls in Python and its dependency tree. We want the the curl dependency tree to be quite light.

Also add plain HTTP mirrors.

[carlocab]

An alternative here (that we could probably do as well) is to drop the Python3 dependency from Ninja. I think it's only needed for generating graphs and such. Building stuff works just fine without Python.

[Bo98]

An alternative here (that we could probably do as well) is to drop the Python3 dependency from Ninja.

I still feel ninja is one more unnecessary dependency here (with no real benefit), but it's probably good to do that anyway. Sounds like dropping the dep would work while still retaining functionality should the user install Python themselves.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.