Lower some build depends to build on squeeze.
+ gcc from 4.7 to 4.4.
+ libfuse-dev from 2.8.4-1.4 to 2.8.4-1.1.
Add fix to find the correct system boot path for zfs.
+ https://github.com/zfsonlinux/zfs/issues/1441#issuecomment-17416105
Fix second part of issue #1441.
When running 'grub_probe --target=device ...' and it returns multiple
results (as if device is a mirror), only take the first line/entry.