Revert "Revert "Cherry pick PR #1909: Use -std=gnu++17 in mac GN conf… #1518

Job	Run time
raspi-2 / initialize	32s
raspi-2-skia / initialize	30s
raspi-2-skia / docker-build-image	31s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	30s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	6m 57s
raspi-2-skia / raspi-2-skia_debug	11m 1s
raspi-2-skia / raspi-2-skia_qa	6m 39s
raspi-2-skia / raspi-2-skia_gold	6m 13s
raspi-2 / raspi_devel	9m 25s
raspi-2 / raspi_debug	10m 23s
raspi-2 / raspi_qa	6m 20s
raspi-2 / raspi_gold	6m 5s
raspi-2 / sbversion-15_devel	8m 22s
raspi-2 / sbversion-15_debug	11m 9s
raspi-2 / sbversion-15_qa	7m 8s
raspi-2 / sbversion-15_gold	7m 24s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / on-host-unit-test-report	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / raspi_on_device_0	38m 57s
raspi-2 / raspi_on_device_1	34m 37s
raspi-2 / raspi_on_device_2	25m 13s
raspi-2 / raspi_on_device_3	33m 33s
raspi-2 / raspi_on_device_4	34m 23s
raspi-2 / raspi_on_device_5	33m 24s
raspi-2 / sbversion-15_on_device_0	36m 17s
raspi-2 / sbversion-15_on_device_1	32m 3s
raspi-2 / sbversion-15_on_device_2	29m 23s
raspi-2 / sbversion-15_on_device_3	35m 27s
raspi-2 / sbversion-15_on_device_4	31m 6s
raspi-2 / sbversion-15_on_device_5	28m 35s
raspi-2 / on-host-unit-test-report	0s
	8h 12m 7s

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