No longer set a fallback value for $STACK
#1308
Merged
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Since it is always set on Heroku:
https://devcenter.heroku.com/articles/buildpack-api#stacks
...and even for other environments, picking an arbitrary stack to use does not make sense, since it's unlikely the runtimes will run on anything but the stack for which they were compiled.
Split out of #1299 to keep that PR smaller.