LU-2800 autoconf: remove LN_5ARGS_SYSCTL_PROC_HANDLER test

LU-2800 autoconf: remove LN_5ARGS_SYSCTL_PROC_HANDLER test

ctl_table.proc_handler has taken 5 arguments since v2.6.32.

We remove the test and dead code. Also eliminate the ll_* prefixed
compatibility shims and empty macros. I've left the LL_PROC_PROTO
macro because it definitely simplifies the appearance of the handler
definitions.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I8c5fc509e1c8bc52705090f5eedf8fb10d549cf5
Reviewed-on: http://review.whamcloud.com/5411
Tested-by: Hudson
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Minh Diep <minh.diep@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>