FreeBSD_HEAD - Build #3725 - Fixed

FreeBSD_HEAD - Build #3725 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3725/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3725/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3725/console

Change summaries:

292987 by hselasky:
Minor LinuxKPI code cleanup:
- Declare some static functions in linux_compat.c instead if inside
  various header files.
- Prefix FreeBSD local functions in the LinuxKPI with "linux_" to
  avoid symbol name conflicts in the future and to make debugging
  easier.
- Make the "struct kobj_ktype" declaractions constant to shave off a
  few bytes from the data segment.

MFC after:	1 week
Sponsored by:	Mellanox Technologies

292986 by hselasky:
Make the kobject refcounting compliant with Linux. Refcounting on the
parent kobject cannot be factored out and must be done by the kobject
consumers.

MFC after:	1 week
Sponsored by:	Mellanox Technologies

292983 by bz:
Bump copyright year.

Happy New Year 2016!

292982 by bz:
Remove unused variable after r292981 to unbreak the build.