If there are no global instances defined, don't provide default &Seri… #112
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This is a fix to issue #111 where if
HardwareSerial Serialis not defined,Adafruit_BusIO_Register.hwill not be able to findSerialand cause compilation to fail.The change only affects the scope where either
NO_GLOBAL_INSTANCESorNO_GLOBAL_SERIALis defined, which is the case where it was failing to compile anyway. In all other cases, the change has no impact. If a dependent is requiring the default argument, then the dependent will not compile anyway if there is no global serial.