develop/open_watcom: Post-SVN tidy

- Move source code from `trunk` into program root directory.
- Update build files.
- Note: Line endings standardised from `CRLF` > `LF`, so best to view diffs with whitespace changes hidden.

programs/develop/open watcom/clib/cgsupp/fsn386.asm

@@ -0,0 +1,56 @@
+;*****************************************************************************
+;*
+;*                            Open Watcom Project
+;*
+;*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
+;*
+;*  ========================================================================
+;*
+;*    This file contains Original Code and/or Modifications of Original
+;*    Code as defined in and that are subject to the Sybase Open Watcom
+;*    Public License version 1.0 (the 'License'). You may not use this file
+;*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
+;*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
+;*    provided with the Original Code and Modifications, and is also
+;*    available at www.sybase.com/developer/opensource.
+;*
+;*    The Original Code and all software distributed under the License are
+;*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+;*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
+;*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
+;*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
+;*    NON-INFRINGEMENT. Please see the License for the specific language
+;*    governing rights and limitations under the License.
+;*
+;*  ========================================================================
+;*
+;* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
+;*               DESCRIBE IT HERE!
+;*
+;*****************************************************************************
+
+
+;========================================================================
+;==     Name:           FSN                                            ==
+;==     Operation:      Floating single negate                         ==
+;==     Inputs:         EAX     flaot value                            ==
+;==     Outputs:        EAX     new float value                        ==
+;==     Volatile:       none                                           ==
+;========================================================================
+include mdef.inc
+include struct.inc
+
+        modstart        fsn386
+
+        xdefp   __FSN
+
+        defpe   __FSN
+        or      EAX,EAX         ; if number not zero
+        _if     ne              ; then
+        xor     EAX,80000000h   ; - flip the sign bit
+        _endif                  ; endif
+        ret                     ; and return!!!
+        endproc __FSN
+
+        endmod
+        end