Migrate the C use of SbAtomic to c11 #15493

Job	Run time
raspi-2 / initialize	45s
raspi-2-skia / initialize	44s
raspi-2-skia / docker-build-image	1m 31s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	1m 36s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	13m 20s
raspi-2-skia / raspi-2-skia_debug	17m 36s
raspi-2-skia / raspi-2-skia_qa	12m 19s
raspi-2-skia / raspi-2-skia_gold	10m 15s
raspi-2 / raspi_devel	14m 1s
raspi-2 / raspi_debug	16m 41s
raspi-2 / raspi_qa	10m 5s
raspi-2 / raspi_gold	9m 49s
raspi-2 / sbversion-17_devel	13m 50s
raspi-2 / sbversion-17_debug	16m 32s
raspi-2 / sbversion-17_qa	10m 0s
raspi-2 / sbversion-17_gold	9m 41s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	2h 38m 45s

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