Add support for statvfs() to FUSE #1172

Job	Run time
cppcheck	1m 25s
code formatting check	16s
min features with gcc	1m 25s
min features with g++	1m 26s
min features with clang	1m 26s
max features with gcc	1m 24s
max features with g++	1m 14s
max features with clang	1m 24s
max features with gcc and DEBUG	1m 25s
max features with gcc for 32-bit arch (legacy OS)	1m 16s
max features with g++ for 32-bit arch (legacy OS)	1m 25s
max features with clang for 32-bit arch (legacy OS)	1m 13s
	15m 19s

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