Cherry pick PR #2121: Make posix_time_wrappers a source_set #1424

Job	Run time
android-arm / initialize	0s
android-arm64 / initialize	0s
android-x86 / initialize	0s
android-arm / docker-build-image	0s
android-arm / docker-unittest-image	0s
android-arm64 / docker-build-image	0s
android-arm64 / docker-unittest-image	0s
android-x86 / docker-build-image	0s
android-x86 / docker-unittest-image	0s
android-arm / ${{ matrix.name }}_${{ matrix.config }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.config }}	0s
android-x86 / ${{ matrix.name }}_${{ matrix.config }}	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / on-host-unit-test-report	0s
android-arm64 / on-host-unit-test-report	0s
android-x86 / on-host-unit-test-report	0s
	0s

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