Cherry pick PR #3174: Migrate starboard impl code to use pthread_create #166

Job	Run time
android-arm64 / initialize	41s
android-arm / initialize	48s
android-x86 / initialize	44s
android-arm64 / docker-build-image	1m 52s
android-arm64 / docker-unittest-image	0s
android-x86 / docker-build-image	1m 49s
android-x86 / docker-unittest-image	0s
android-arm / docker-build-image	1m 47s
android-arm / docker-unittest-image	0s
android-arm64 / arm64_devel	19m 45s
android-arm64 / arm64_debug	17m 44s
android-arm64 / arm64_qa	8m 28s
android-arm64 / arm64_gold	8m 9s
android-x86 / x86_devel	20m 10s
android-x86 / x86_debug	22m 40s
android-x86 / x86_qa	8m 58s
android-x86 / x86_gold	8m 6s
android-arm / arm_devel	19m 1s
android-arm / arm_debug	19m 5s
android-arm / arm_qa	8m 52s
android-arm / arm_gold	8m 43s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
upload-release-artifacts	10s
	2h 57m 32s

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