- Added configure flag " --enable-forward-compat86" to be able to
  build binaries of XOTcl with Tcl 8.5 that can be used as well under
  Tcl 8.6
- Bump version number of XOTcl to 1.6.9
- add "." to SUFFIXES since this is apparently needed for msys 1.0
  (many thanks to Andreas Kupries for reporting the problem)