RTC2RTMP: Fix screen sharing stutter caused by packet loss. v5.0.216 v6.0.157 v7.0.18 #3624

Job	Run time
cygwin64-cache	1m 42s
multiple-arch-aarch64	22m 51s
multiple-arch-armv7	22m 3s
utest-regression-blackbox-test	9m 37s
fast	1s
cygwin64	14m 18s
build-ubuntu16	3m 10s
build-ubuntu20	3m 33s
build-centos7	4m 57s
build-cross-aarch64	7m 21s
build-cross-arm	5m 12s
build-ubuntu18	3m 2s
coverage	3m 43s
multiple-arch-amd64	2m 21s
test-done	1s
	1h 43m 52s

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