- added tds patch (fix mssql backend build with freetds; the one built with skip_post_check_so was useless)
- build odbc backend, added oracle bcond to allow build oracle backend
- package missing files, general cleanup; handle only system soname symlinks
  by ldconfig and just own symlinks in private directory (btw, the modules
  could be built with -avoid-version as well, as they are dlopened just by .so)