Firmware build

Fix issue using `String.concat` with flash strings (fix #2268) #773

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Job	Run time
build_padded (ESPRUINOBOARD)	1m 8s
build_main (LINUX)	28s
build_dfu (PUCKJS)	1m 35s
build_padded (PICO_R1_3)	1m 26s
build_main (ESP32)	40s
build_dfu (PIXLJS)	1m 56s
build_padded (ESPRUINOWIFI)	1m 33s
build_main (ESP8266_BOARD)	40s
build_dfu (MDBT42Q)	1m 58s
build_main (ESP8266_4MB)	30s
build_dfu (BANGLEJS)	1m 58s
build_main (MICROBIT1)	1m 11s
build_dfu (BANGLEJS2)	2m 48s
build_main (MICROBIT2)	2m 12s
build_dfu (PUCKJS_MINIMAL)	1m 24s
	21m 27s