Squash pthreaded ubik warnings

Squash pthreaded ubik warnings

Fix/ignore some warnings with --enable-pthreaded-ubik:

 - ubik/ubik.c: move rx_stackSize decl to non-pthread code, since it's
   only used there

 - budb/db_dump.c: move 'code' decl to non-pthread code, since it's only
   used there

 - ubik/recovery.c: move return to outside the ifdef, so we still have a
   return statement in the pthreaded case

 - Add -Wno-error to beacon.c in tubik, to match the ubik case

Change-Id: I614f2425c36e77bb1a08838b45166d8edb080c73
Reviewed-on: http://gerrit.openafs.org/1211
Tested-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>