Make serf report a base_checksum to apply_textdelta.
Make serf report a base_checksum to apply_textdelta.

* subversion/libsvn_ra_serf/update.c
  (report_info_t): Add base_checksum variable.
  (push_state): Initialize report_info_t using pcalloc to clear uninitialized
    variables.
  (handle_fetch, handle_propchange_only): Provide checksum to apply_textdelta.
  (start_report): Fetch base-checksum from fetch-file and store it for
    use by apply_textdelta.

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