Summary:
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There is an issue whereas when Flipper Server is launched NOT from the terminal, it doesn't inherit the user's terminal `$PATH` variable.
This causes a few different issues.
This change tries to address that.
Reviewed By: passy
Differential Revision: D46392435
fbshipit-source-id: 6201a1749134db8c50eca8751af149737dce57d7