Linux: kmem_cache_create fix and cleanup

Linux: kmem_cache_create fix and cleanup

Fix the kmem_cache constructor function to match the current
expected prototype, and cleanup related code.  This has been wrong
for a while, but since we were just passing extra parameters the
only effect was to generate a warning.

- Add a new configure test to detect the new constructor function
signature
- Define the older versions of the constructor in osi_compat.h,
making them call the current version
- Move a few compatibility #defines to osi_compat.h

(cherry picked from 3abc87a5a94f0d5eaca702c7bd66fbe35ce7b896)
Reviewed-on: http://gerrit.openafs.org/657
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
Change-Id: I3570a3268d35ac73409b96816ba5112f809f6645
Reviewed-on: http://gerrit.openafs.org/994
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>