Do not look at the system PATH variable when looking for libraries.

[glowmouse]

When the Linux system path includes $(ARDUINO_SDK_PATH), CMAKE searches

$(ARDUINO_SDK_PATH)/libraries

for libraries instead of

$(ARDUINO_SDK_PATH)/hardware/arduino/avr/libraries

Adding NO_SYSTEM_ENVIRONMENT_PATH tells cmake not to consider the Linux Path when looking for files.

Fixes #58

[MrPointer]

@glowmouse Hi and welcome to the project!
It's a great fix here, and it's strange nobody has encountered it yet, not even the CI setup - As it does use the system PATH variable... Just take a look at my small change request and we're good to go.
Besides, I hope it won't break anything 😆

[MrPointer]

Besides the subtle implementation details we're currently discussing, I propose that this change will be reflected in all find_file occurrences regarding platform elements (It's part of the same file), since it may be duplicated in other elements as well, and it's a shame we won't fix everything at once.

@glowmouse I don't want to merge the fix until you resolve the written above as well, thanks.

[MrPointer]

Great job, thanks!