WebRTC: Add support for A/V only WHEP/WHEP player. v6.0.116 #3178

Job	Run time
cygwin64-cache	2m 49s
multiple-arch-aarch64	5m 44s
utest-regression-blackbox-test	5m 6s
multiple-arch-armv7	5m 43s
fast	1s
cygwin64	6m 49s
build-centos7	2m 21s
build-ubuntu20	1m 42s
build-ubuntu16	1m 37s
build-cross-aarch64	2m 25s
build-cross-arm	2m 28s
build-ubuntu18	1m 34s
coverage	2m 31s
multiple-arch-amd64	1m 16s
test-done	1s
	42m 7s

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