Sam Clegg b4c9194d81 Unset emsdk-related environment variable from inactive tools (#801) ...

When we deactivate a tool we also want to remove its environment
variables.   One driver for this is that modern sdks don't set
`EM_CACHE` whereas old ones did and we want to make sure that
`EM_CACHE` gets unset when folks upgrade (and then re-set if
they downgrade).  See #797.

2021-04-29 08:43:20 -07:00

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