build using our own copy of HFuse
build using our own copy of HFuse

kills annoying external dependency, and allows us to change HFuse
as needed (e.g., to expose the fuse low-level API)

mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl