GFX: add config which to prefer H264 vs RFX #2131

Job	Run time
code formatting check	16s
cppcheck	18m 21s
min features with gcc	2m 44s
min features with g++	2m 25s
min features with clang	1m 58s
max features with gcc	3m 53s
max features with g++	2m 23s
max features with clang	3m 46s
max features with clang and AddressSanitized	3m 43s
max features with gcc and DEBUG	2m 29s
max features with gcc for 32-bit arch (legacy OS)	1m 42s
max features with g++ for 32-bit arch (legacy OS)	1m 28s
max features with clang for 32-bit arch (legacy OS)	2m 11s
	47m 19s

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