Remove usages of no-op POEMs (libevent) #7488

Job	Run time
raspi-2 / initialize	33s
raspi-2-skia / initialize	33s
raspi-2-skia / docker-build-image	1m 16s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	1m 14s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	7m 39s
raspi-2-skia / raspi-2-skia_debug	11m 8s
raspi-2-skia / raspi-2-skia_qa	6m 28s
raspi-2-skia / raspi-2-skia_gold	6m 58s
raspi-2 / raspi_devel	8m 59s
raspi-2 / raspi_debug	11m 4s
raspi-2 / raspi_qa	7m 14s
raspi-2 / raspi_gold	6m 21s
raspi-2 / sbversion-15_devel	9m 42s
raspi-2 / sbversion-15_debug	10m 47s
raspi-2 / sbversion-15_qa	6m 48s
raspi-2 / sbversion-15_gold	7m 6s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / raspi_on_device_0	37m 36s
raspi-2 / raspi_on_device_1	31m 18s
raspi-2 / raspi_on_device_2	33m 42s
raspi-2 / raspi_on_device_3	30m 11s
raspi-2 / raspi_on_device_4	40m 35s
raspi-2 / raspi_on_device_5	29m 7s
raspi-2 / sbversion-15_on_device_0	48m 37s
raspi-2 / sbversion-15_on_device_1	33m 11s
raspi-2 / sbversion-15_on_device_2	28m 46s
raspi-2 / sbversion-15_on_device_3	36m 48s
raspi-2 / sbversion-15_on_device_4	36m 58s
raspi-2 / sbversion-15_on_device_5	36m 54s
	8h 47m 33s

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