LU-7589 build: update checkpatch to ~4.13-rc1 kernel

LU-7589 build: update checkpatch to ~4.13-rc1 kernel

Update checkpatch.pl to v4.12-11743-g96d0d83 kernel version.

This version includes new functionality that allows us to
replace the Lustre specific dep_functions and dep_includes
checks added in our local version with the "spelling.txt"
file.

Allow CDEBUG/CERROR/LCONSOLE/DEBUG_REQ text strings to exceed
80 columns, as with upstream printk messages.

Test-Parameters: trivial

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I2a16bbd85722b15eb9188eb504bac3a2f63ebbe5
Reviewed-on: https://review.whamcloud.com/28055
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>