GFX: Relegate some logs to LOG__LEVEL_DEBUG #354

Job	Run time
code formatting check	15s
cppcheck	17m 32s
min features with gcc	2m 9s
min features with g++	2m 15s
min features with clang	2m 4s
max features with gcc	3m 11s
max features with g++	1m 59s
max features with clang	3m 7s
max features with gcc and DEBUG	2m 51s
max features with gcc for 32-bit arch (legacy OS)	1m 24s
max features with g++ for 32-bit arch (legacy OS)	1m 50s
max features with clang for 32-bit arch (legacy OS)	1m 49s
	40m 26s

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