Check waitpid is not interrupted by a signal #1537

Job	Run time
cppcheck	1m 54s
code formatting check	21s
min features with gcc	2m 53s
min features with g++	3m 12s
min features with clang	3m 33s
max features with gcc	4m 39s
max features with g++	2m 49s
max features with clang	4m 23s
max features with gcc and DEBUG	2m 34s
max features with gcc for 32-bit arch (legacy OS)	2m 8s
max features with g++ for 32-bit arch (legacy OS)	2m 23s
max features with clang for 32-bit arch (legacy OS)	2m 47s
	33m 36s

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