remove some unnecessary code #122

Job	Run time
code formatting check	19s
cppcheck	18m 10s
min features with gcc	1m 55s
min features with g++	2m 25s
min features with clang	2m 15s
max features with gcc	2m 42s
max features with g++	2m 26s
max features with clang	3m 31s
max features with clang and AddressSanitized	2m 32s
max features with gcc and DEBUG	1m 56s
max features with gcc for 32-bit arch (legacy OS)	1m 30s
max features with g++ for 32-bit arch (legacy OS)	1m 30s
max features with clang for 32-bit arch (legacy OS)	1m 50s
	43m 1s

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