Convert paths to local style before passing them to the diff and diff3 external commands.
Convert paths to local style before passing them to the diff and diff3
external commands.

* subversion/libsvn_subr/io.c
  (svn_io_run_diff); Convert 'to' and 'from' to local paths before running
  the external diff command.

  (svn_io_run_diff3); Convert 'mine', 'yours', and 'older' to local paths
  before running the external diff3 command.



git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@851763 13f79535-47bb-0310-9956-ffa450edef68

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