Improve ra_svn error reporting a bit when using SVN_DEBUG.
Improve ra_svn error reporting a bit when using SVN_DEBUG.

* subversion/libsvn_ra_svn/marshal.c
  (includes): Add private/svn_error_private.h.
  (svn_ra_svn_write_cmd_failure): Don't repeat the real error for trace links,
    to allow filtering for trace errors on the other side.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1148434 13f79535-47bb-0310-9956-ffa450edef68

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