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Add PLATFORM_PATH variable to the root hardware directory for a given
architecture to avoid duplication between boards.txt, cores, platform
libraries, etc.
I needed to access this value and was hoping to inherit it, when I learned that it did not exist as a distinct variable in Arduino.mk. It seemed like it would be generally useful and a bit more DRY to define it independently. So I thought I would offer it in case you find it useful. No worries if you'd rather not.
I opted to avoid setting PLATFORM_PATH in the case where any of the ALTERNATE_CORE variables are set. I realize that there is some duplication between the concepts and it may be confusing. I figured sticking with the minimally invasive simple refactoring was safest.