Irix: Make compiler less chatty

Irix: Make compiler less chatty

Supress a few of our errors from the Irix compiler and linker, so its
output is a little less verbose.

This change suppresses the function declared but not used and
multiple declaration errors that we get due to our static_inline fudge
and the paramater declared but not used errors.

Other error suppression is possible - you just need the number
immediately after the 'cc-' in the build logs to say which number to
add to the -woff line.

Change-Id: I55485ff422feeecbb922e8fd63321605d6a8575c
Reviewed-on: http://gerrit.openafs.org/2908
Tested-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>