Log Message:
Update FUSE to 2.8.4 and add NetBSD support through filesystems/perfuse

Changes since previous verion, from the NEWS file

2.8.x:
- More scalable directory tree locking
- Atomic open(O_TRUNC) support
- Support big write requests on kernels 2.6.26 and newer
- Out-of-tree fuse module removed
- Better NFS exporting support
- New ioctl and poll requests
- New CUSE (Character Device in Userspace) interface
- Allow umask processing in userspace
- Added cache invalidation notifications
- Bugfixes and small improvements
2.7.x:
 - Stacking support for the high level API
 - Add filename charset conversion module
 - Improved mounting
2.6.x!
 - Improved read characteristics (asynchronous reads)
 - Support for aborting filesystem connection
 - POSIX file locking support
 - Request interruption support
 - Building module for Linux kernels earlier than 2.6.9 not supported
 - Allow block device based filesystems to support swap files
 - Several bugs fixed, including a rare system hang on SMP