Fix link error with gcc4.6

'make cstatfs' resulting below link error.
  statfs.o: In function `main':
  statfs.cc:(.text.startup+0x168): undefined reference to `fuse_main_real'
  collect2: ld returned 1 exit status

(g++ 4.6.1 Ubuntu Oneiric)

Linker flag '--as-needed' is used by default on Ubuntu Oneiric. This
patch fixes the link error by change objects and libraries order.
Signed-off-by: Haitao Li <lihaitao@gmail.com>

Now, nodeId and lookupCount are exclusively used for kernel
communication, and a nodeId may change during the lifetime of the
Inode if the same node is forgotten and looked up again.

treeLock.

FsNode has no Inode.

If not (in case of hardlink), increase the lookupCount for the inode.

To use hard-links, the FileSystem should return consistent
FileInfo.Ino data from the GetAttr call.