[v0.10] add OpenH264 support #2229

Job	Run time
cppcheck	19m 14s
code formatting check	26s
min features with gcc	2m 25s
min features with g++	2m 7s
min features with clang	2m 11s
max features with gcc	3m 11s
max features with g++	1m 53s
max features with clang	3m 35s
max features with gcc and DEBUG	2m 28s
max features with gcc for 32-bit arch (legacy OS)	1m 52s
max features with g++ for 32-bit arch (legacy OS)	1m 49s
max features with clang for 32-bit arch (legacy OS)	1m 41s
	42m 52s

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