Add SS declaration to Arduino.h for SD lib compatibility #72
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The built-in SD examples require SS to be defined even though the chip select pin is set inside the INO.
This removes the need to have SS in variant files.
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Add a #define SS to Arduino.h instead of variant files. This pin is required by the built in SD lib for Arm architectures but is often (if not always?) over written by a local chipSelect or equivalent pin - so the actual value of SS is fairly arbitrary.