Make the flush_entries() function fetch its own PDH, allowing callers to avoid fetching it.
Make the flush_entries() function fetch its own PDH, allowing callers to avoid
fetching it.

This has the side effect of causing flush_entries() to flush both the current,
as well as the parent's caches in all cases.  But since that will only happen
in the backward compat scenario, it will have neglible real performance impact.

* subversion/libsvn_wc/wc_db.c
  (flush_entries): Don't take a PDH param, fetch one internally.
  [elsewhere]: Adjust callers to not provide a PDH.

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