Add EEPROM programming target to the AVRDUDE build system module. Correct message output test for the BUILD build system module. Clean up DOXYGEN build system module logic.
@echo $(MSG_AVRDUDE_CMD) Programming device \"$(MCU)\" with settings \"$(AVRDUDE_FLASH_FLAGS)\" using \"$(AVRDUDE_PROGRAMMER)\" on port \"$(AVRDUDE_PORT)\"
@echo $(MSG_AVRDUDE_CMD) Programming device \"$(MCU)\" with settings \"$(AVRDUDE_EEP_FLAGS)\" using \"$(AVRDUDE_PROGRAMMER)\" on port \"$(AVRDUDE_PORT)\"