Remove code in AS400 #ifdef from libsvn_repos/hook.c, as they are dead code in trunk.
Remove code in AS400 #ifdef from libsvn_repos/hook.c, as they are
dead code in trunk.

* subversion/libsvn_repos/hook.c
  Remove #include for AS400 #ifdef.
  (run_hook_cmd): Remove AS400 #ifdef and the code in it.

Approved by: pburba

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion