Fix a compile warning introduced in r7813:
Fix a compile warning introduced in r7813:

* subversion/libsvn_client/export.c
  (copy_versioned_files): Remove unused variable 'date'.

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