Fix bug in special file detranslation, where the file content would be removed instead of copied in one case.
Fix bug in special file detranslation, where the file content would be removed
instead of copied in one case.

* libsvn_subr/subst.c (detranslate_special_file): Create the source
  stream from the source file and not the destination file when the file
  is a regular file.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@851515 13f79535-47bb-0310-9956-ffa450edef68

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