newconfig: use correct destination size for strncpy #440

Job	Run time
code formatting check	17s
cppcheck	17m 53s
min features with gcc	2m 23s
min features with g++	3m 13s
min features with clang	2m 36s
max features with gcc	4m 5s
max features with g++	2m 55s
max features with clang	4m 32s
max features with clang and AddressSanitized	2m 44s
max features with gcc and DEBUG	2m 28s
max features with gcc for 32-bit arch (legacy OS)	1m 39s
max features with g++ for 32-bit arch (legacy OS)	1m 34s
max features with clang for 32-bit arch (legacy OS)	1m 49s
	48m 8s

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