[v0.10] add OpenH264 support #2232

Job	Run time
cppcheck	18m 23s
min features with gcc	2m 22s
code formatting check	18s
min features with g++	1m 41s
min features with clang	2m 14s
max features with gcc	3m 20s
max features with g++	2m 22s
max features with clang	4m 29s
max features with gcc and DEBUG	2m 8s
max features with gcc for 32-bit arch (legacy OS)	1m 32s
max features with g++ for 32-bit arch (legacy OS)	1m 57s
max features with clang for 32-bit arch (legacy OS)	1m 40s
	42m 26s

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