RTC2RTMP: Fix screen sharing stutter caused by packet loss. v5.0.216 v6.0.157 v7.0.18 #3625

Job	Run time
multiple-arch-aarch64	23m 0s
cygwin64-cache	1m 43s
multiple-arch-armv7	22m 10s
utest-regression-blackbox-test	8m 29s
cygwin64	15m 56s
fast	1s
build-centos7	5m 4s
build-ubuntu18	3m 10s
build-cross-aarch64	5m 4s
build-cross-arm	5m 14s
build-ubuntu16	3m 6s
build-ubuntu20	3m 31s
coverage	3m 35s
multiple-arch-amd64	2m 21s
test-done	0s
	1h 42m 24s

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