Irix: Supress some more warnings in kernel builds

Irix: Supress some more warnings in kernel builds

Suppress the following warnings in kernel builds:
 *) The function "blah" was declared but never referenced (1174)
 *) The indicated trailing comma is non-standard (1201)
 *) The parameter "blah" was never referenced (3201)
 *) implicit conversion of a 64-bit integral type to a smaller
    integral type (3968)

Change-Id: If6cf21f287b5aefa06daaa2807e05a84e391fa95
Reviewed-on: http://gerrit.openafs.org/4419
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>