Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

/* -> /*- for license, minor formatting changes

Fixed pedantic syntax error (trailing semicolon in enum).

NULL commit due to misunderstanding "cvs commit -m <blah>". The
previous log message "/home/brooks/ng_gif.message" should have read:

Add a pair of new netgraph nodes. The ng_gif node is like ng_ether
except that it works on gif interfaces. The ng_gif_demux node attaches
to an ng_gif node to allow separate processing or discarding of
different types of encapsulated traffic.

The initial commit contained an error in the license, this is the
correct one.

/home/brooks/ng_gif.message