Add lint check
Add lint check

The existing makefile use cppcheck when it's installed.  The master
code currently passes cleanly with cppcheck 1.72 and we plan to keep
it that way.

Signed-off-by: Brian Behlendorf <32d50ad1e384dcb9a5bf7e40fa470df5dabaf348@llnl.gov>

zfsonlinux/zfs-buildbot,zfsonlinux/zfs-buildbot,gmelikov/zfs-buildbot,gmelikov/zfs-buildbot