MFC r301549, r301550:

MFC r301549, r301550:
ng_mppc(4): Bring netgraph(3) MPPC compression support.

Support for compression has been available from July 2007 but it
was never imported due to concerns with patents once held by
STAC/HiFn. The issues have clearly been resolved so bring it
in now.

Special thanks to Brett Glass for preserving the code and
pointing documentation for the expiration case.

Taken from:	mav (through Brett Glass)

git-svn-id: svn://svn.freebsd.org/base/stable/9@302062 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f