Add support for statvfs() to FUSE #2199

Job	Run time
code formatting check	15s
cppcheck	4m 11s
min features with gcc	1m 59s
min features with g++	2m 36s
min features with clang	2m 19s
max features with gcc	3m 14s
max features with g++	5m 8s
max features with clang	3m 21s
max features with clang and AddressSanitized	2m 38s
max features with gcc and DEBUG	2m 10s
max features with gcc for 32-bit arch (legacy OS)	1m 45s
max features with g++ for 32-bit arch (legacy OS)	1m 24s
max features with clang for 32-bit arch (legacy OS)	1m 25s
	32m 25s

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