ra_serf: Do not try to fetch text deltas if we aren't asked for them by our reporter.
ra_serf: Do not try to fetch text deltas if we aren't asked for them by our
reporter.

Pass stat test #15 (status -u in partially non-recursive wc)

* subversion/libsvn_ra_serf/update.c
  (fetch_file): Only fetch the file when text deltas are requested.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@859139 13f79535-47bb-0310-9956-ffa450edef68

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