J. David Ibáñez 77df3eedbd sys/arduino: millis() expected to have C linkage
This fixes building tests/pkg_arduino_sdi_12 for the hifive1b board.

The problem is, in build/pkg/arduino_api/api/Common.h millis is defined
within an extern "C" block. While in sys/arduino/include/arduino.hpp it
was not.
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..
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