Cherry pick PR #1329: Change libopus to not export symbols #753

Job	Run time
raspi-2 / initialize	38s
raspi-2-skia / initialize	35s
raspi-2-skia / docker-build-image	34s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	35s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	8m 27s
raspi-2-skia / raspi-2-skia_debug	10m 9s
raspi-2-skia / raspi-2-skia_qa	8m 42s
raspi-2-skia / raspi-2-skia_gold	7m 27s
raspi-2 / raspi_devel	8m 41s
raspi-2 / raspi_debug	10m 20s
raspi-2 / raspi_qa	8m 17s
raspi-2 / raspi_gold	8m 5s
raspi-2 / sbversion-13_devel	8m 36s
raspi-2 / sbversion-13_debug	9m 24s
raspi-2 / sbversion-13_qa	8m 55s
raspi-2 / sbversion-13_gold	7m 27s
raspi-2 / sbversion-14_devel	8m 53s
raspi-2 / sbversion-14_debug	10m 17s
raspi-2 / sbversion-14_qa	7m 47s
raspi-2 / sbversion-14_gold	7m 44s
raspi-2 / sbversion-15_devel	8m 53s
raspi-2 / sbversion-15_debug	10m 50s
raspi-2 / sbversion-15_qa	9m 19s
raspi-2 / sbversion-15_gold	7m 52s
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 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / on-host-unit-test-report	0s
	2h 58m 27s

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