remove MSC_VER from starboard #15551

Job	Run time
raspi-2 / initialize	44s
raspi-2-skia / initialize	42s
raspi-2-skia / docker-build-image	2m 10s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	2m 8s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	6m 8s
raspi-2-skia / raspi-2-skia_debug	6m 7s
raspi-2-skia / raspi-2-skia_qa	6m 5s
raspi-2-skia / raspi-2-skia_gold	6m 8s
raspi-2 / raspi_devel	6m 4s
raspi-2 / raspi_debug	6m 4s
raspi-2 / raspi_qa	6m 3s
raspi-2 / raspi_gold	6m 3s
raspi-2 / sbversion-17_devel	6m 3s
raspi-2 / sbversion-17_debug	6m 3s
raspi-2 / sbversion-17_qa	6m 3s
raspi-2 / sbversion-17_gold	6m 2s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	1s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	1s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	1s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	1s
	1h 18m 41s

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