Ignore old style definition warnings in generated code

Ignore old style definition warnings in generated code

Older flex can generate functions that trigger the
"old-style-definition" warning.
Since it's generated code, just ignore it.

Change-Id: If475507561498b976a2942bd0084975814ab6a76
Reviewed-on: http://gerrit.openafs.org/2603
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 850567f17285021d3133a75c1d0d3494e0faabfc)
Reviewed-on: http://gerrit.openafs.org/2670