Fix a build failure and a pool inefficiency both introduced in r927373.
Fix a build failure and a pool inefficiency both introduced in r927373.

* subversion/libsvn_wc/adm_ops.c
  (svn_wc_process_committed_queue2): Use svn_hash__clear() instead of
    apr_hash_clear() which is only available in APR >= v1.3.0.  Improve pool
    usage by passing iterpool rather than scratch_pool.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@927456 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion