Added missing SPI_HAS_TRANSACTION define, so libraries can tell that … #421
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…the API is available
See: https://github.com/arduino/ArduinoCore-avr/blob/24e6edd475c287cdafee0a4db2eb98927ce3cf58/libraries/SPI/src/SPI.h#L19-L21
Fx this is used by the USB Host Shield 2.0 library: felis/USB_Host_Shield_2.0#654
Note that I did not add the SPI_HAS_NOTUSINGINTERRUPT define, as "usingInterrupt" and "notUsingInterrupt" are empty and should really be removed or implemented