Enable __cplusplus preprocessor macro in xb1 build #6191

Job	Run time
raspi-2 / initialize	40s
raspi-2-skia / initialize	42s
raspi-2 / docker-build-image	1m 17s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	1m 15s
raspi-2-skia / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	6m 59s
raspi-2-skia / raspi-2-skia_debug	10m 38s
raspi-2-skia / raspi-2-skia_qa	7m 31s
raspi-2-skia / raspi-2-skia_gold	6m 33s
raspi-2 / raspi_devel	7m 10s
raspi-2 / raspi_debug	11m 9s
raspi-2 / raspi_qa	6m 24s
raspi-2 / raspi_gold	6m 22s
raspi-2 / sbversion-15_devel	7m 47s
raspi-2 / sbversion-15_debug	11m 1s
raspi-2 / sbversion-15_qa	7m 6s
raspi-2 / sbversion-15_gold	6m 33s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	1h 39m 7s

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