Improve svn patch performance significantly.
Improve svn patch performance significantly.

* subversion/libsvn_diff/parse-diff.c
  (svn_diff_open_patch_file): Open patch file with APR_BUFFERED flag.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1486915 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion