Use new header for prelude

\ prelude  higher-level words

\ Copyright (C) 2009 Free Software Foundation, Inc.

\ Copyright (C) 2019 Free Software Foundation, Inc.

\ This file is part of Gforth.

\ You should have received a copy of the GNU General Public License

\ along with this program. If not, see http://www.gnu.org/licenses/.

[defined] next-prelude [if]

: prelude ( xt -- )

    next-prelude ! ;

[then]

    \G prelude adds a prelude to the current definition without special

    \G compilation semantics.  a prelude is executed in the interpreter before

    \G the words compilation or interpretation or postpone semantics is used.

    dup [n:d execute ;] set->int

    [n:d execute default-name>comp ;] set->comp ;