Remove obsolete multi-db code.
Remove obsolete multi-db code.

* subversion/libsvn_wc/cleanup.c
  (cleanup_internal): Remove conditional multi-db code.
  (svn_wc_cleanup3): Remove conditional, add comment.

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