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Up to [gforth] / gforth / arch / generic

Dos Changes:
!!Moved:
engine/32bit.h moved to arch/generic/machine.h
cache.c moved to arch/hppa/
cleanalign.c moved to engine/
!!New Files:
envos.* *.bsh
Instead of linking arch/xy/machine.h an custom include path is used
engine.a engine.o main.o makes with engine/Makefile now
history.fs and startup.fs works for dos and unix now
environment variable osclass is set in envos.fs, wich is os-specific
any comments?
supressed some warnings in main.c

    1: /*
    2:   This is a generic file for 32-bit machines with IEEE FP arithmetic (no VMS).
    3:   It only supports indirect threading.
    4: 
    5:   Copyright (C) 1995 Free Software Foundation, Inc.
    6: 
    7:   This file is part of Gforth.
    8: 
    9:   Gforth is free software; you can redistribute it and/or
   10:   modify it under the terms of the GNU General Public License
   11:   as published by the Free Software Foundation; either version 2
   12:   of the License, or (at your option) any later version.
   13: 
   14:   This program is distributed in the hope that it will be useful,
   15:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   16:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   17:   GNU General Public License for more details.
   18: 
   19:   You should have received a copy of the GNU General Public License
   20:   along with this program; if not, write to the Free Software
   21:   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   22: */
   23: 
   24: /* define this if IEEE singles and doubles are available as C data types */
   25: #define IEEE_FP
   26: 
   27: /* the IEEE types are used only for loading and storing */
   28: /* the IEEE double precision type */
   29: typedef double DFloat;
   30: /* the IEEE single precision type */
   31: typedef float SFloat;
   32: 
   33: #ifndef USE_FTOS
   34: #ifndef USE_NO_FTOS
   35: /* keep top of FP stack in register. Since most processors have FP
   36:    registers and they are hardly used in gforth, this is usually a
   37:    good idea.  The 88100 has no separate FP regs, but many general
   38:    purpose regs, so it should be ok */
   39: #define USE_FTOS
   40: #endif
   41: #endif
   42: /* I don't do the same for the data stack (i.e. USE_TOS), since this
   43:    loses on processors with few registers. USE_TOS might be defined in
   44:    the processor-specific files */
   45: 
   46: #ifdef DIRECT_THREADED
   47: /* If you want direct threading, write a .h file for your processor! */
   48: /* We could put some stuff here that causes a compile error, but then
   49:    we could not use this file in the other machine.h files */
   50: #endif
   51: