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

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

Set WERROR= for the nve(4) module. This driver gives several warnings
with clang, which will probably never be fixed, as it is unmaintained,
and superseded by nfe(4).

MFC after: 1 week

Due to a CVS misfire, I ended up committing the wrong version of this.

FreeBSD consumer bits of the nForce MCP NIC binary blob.

Demanded by: DES
Encouraged by: scottl
Obtained from: q@onthenet.com.au (partially)
KNF'ed by: obrien