r1859: * Reverted change in 4.1.9, so generation of EXCLUDE_FIND escapes "." to

r1859: * Reverted change in 4.1.9, so generation of EXCLUDE_FIND escapes "." to
  "\\.", which turns into "\." after being run through the shell, and
  prevents find from treating -X.svn as a regexp that matches files such
  as foo/svn.vim. (It's safe to do this now that all uses of EXCLUDE_FIND are
  via complex_doit(), which was not the case of dh_clean when this change
  was originally made.) Closes: #349070