fix for U486: Can't get Nethack 3.4.1 to work

>nhversion: 3.4.1
>
> nhfrom: 3.4.1 Official binary release for Windows 95/98/NT/2000/Me/XP
> (nh341win.zip)
> comments: Whenever I run NethackW.exe, the nethack window
> appears, and does not run anything.  When I close out of the
> program, I get this message:
> Waiting for access to C:\GAMES\NETHACK341\record.  (X  retries left).  > The X seems to  always be either 9 or 59.  I don't know how to fix this > > problem, any help would  be greatly appreciated

<Someone> writes:
>win32 open() returns -1 if failed - same as POSIX open().
> There is no STDIN in GUI applications so 0 is a valid return
> value from open().
> So it should read like that unless that breaks Amiga code:

Since I can't test the Amiga code, I added a macro
OPENFAILURE to keep the Amiga code the same as it
is now.  It should probably be reviewed by someone on
the Amiga team to verify if open() on the Amiga returns
0 or -1 on failure.  If the latter, the macro could be
removed completely.

doc/fixes34.2

@@ -98,6 +98,10 @@ vms: create an empty paniclog file during playground installation
 win32tty: add subkeyvalue option to alter key values; Finnish keyboard fix
 win32tty: distinguish between black/gray/white (by Quietust)
 win32gui: prevent male Valkyrie and other incorrect startup settings
+win32: some code in files.c was incorrectly assuming that a file
+	descriptor return value of 0 from open() was invalid but it 
+	could be valid on win32gui where stdin, stdout, stderr aren't open;
+	now it correctly checks for return value < 0 from open() 
 tiles: high priest tile had a couple bad pixels
 tiles: bad pixels in Croesus and Yeenoghu tiles
 FreeBSD: incorrect srandom declaration