ext2fs: Remove sys/gnu/vfs/ext2fs and make sys/vfs/ext2fs the default

This commit removes the old+unstable GPL ext2 implementation,
and makes the new FreeBSD based ext2 implementation
(since cfe6039

ext2fs: Remove sys/gnu/vfs/ext2fs and make sys/vfs/ext2fs the default

This commit removes the old+unstable GPL ext2 implementation,
and makes the new FreeBSD based ext2 implementation
(since cfe603905713d4e92a7956678970d5dff8e913f2) the default.

- Remove sys/gnu/vfs.
- Rename sys/vfs/ext2fs/ext2fs_freebsd.ko -> ext2fs.ko.
- Modify unusual userspace program which includes kernel struct.
- Bump __DragonFly_version to 600107.

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kernel: Move GPL'd kernel files to sys/gnu to have them all in one place.

This affects files in sys/dev/sound/pci/gnu and sys/vfs/gnu/ext2fs.

sys/gnu is analogous to the gnu directory for userland,

kernel: Move GPL'd kernel files to sys/gnu to have them all in one place.

This affects files in sys/dev/sound/pci/gnu and sys/vfs/gnu/ext2fs.

sys/gnu is analogous to the gnu directory for userland, i.e. below it, we
follow the same hierarchy as in /usr/src/sys.

This commit changes the location of the ext2fs headers, which are public,
so I've bumped __DragonFly_version in order to have something to patch
against in pkgsrc, in case this causes build breakage for any packages.

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libfsid(3): Make the filesystem type an enum and perform misc cleanup.

libfsid - A new library to determine filesystems.

* The idea is extracted from the sbin/fsid tool. The library provides an
interface to probe a given device for a file system and get its volume

libfsid - A new library to determine filesystems.

* The idea is extracted from the sbin/fsid tool. The library provides an
interface to probe a given device for a file system and get its volume
label.

* fsid was changed to use libfsid functionality.

Sponsored-by: Google Code-In

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