boards/arduino-due: use shared BOSSA tooling

boards/arduino-due/Makefile.include

@@ -6,9 +6,9 @@ export CPU_MODEL = sam3x8e
 PORT_LINUX ?= /dev/ttyACM0
 PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
 
-# define board specific flasher options
-export FLASHER = $(RIOTBOARD)/$(BOARD)/dist/flash.sh
-export OFLAGS = -O binary
-
 # setup serial terminal
 include $(RIOTMAKE)/tools/serial.inc.mk
+
+# setup flasher (using BOSSA)
+export BOSSA_ARDUINO_PREFLASH = yes
+include $(RIOTMAKE)/tools/bossa.inc.mk

boards/arduino-due/dist/flash.sh

-#!/bin/sh
-
-if [ `uname` = "Linux" ]; then
-    stty -F "${PORT}" raw ispeed 1200 ospeed 1200 cs8 -cstopb ignpar eol 255 eof 255
-    "${RIOTBOARD}"/"${BOARD}"/dist/bossac  -R -e -w -v -b "${HEXFILE}"
-elif [ `uname` = "Darwin" ]; then
-    stty -f ${PORT} raw ispeed 1200 ospeed 1200 cs8 -cstopb ignpar eol 255 eof 255
-    "${RIOTBOARD}"/"${BOARD}"/dist/bossac_osx -R -e -w -v -b "${HEXFILE}"
-else
-    echo "CAUTION: No flash tool for your host system found!"
-fi