bug#12316: Simplify redefinition of 'abort'.

[Eli Zaretskii <eliz@gnu.org>]

> Date: Thu, 30 Aug 2012 20:14:51 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: Eli Zaretskii <eliz@gnu.org>, Juanma Barranquero <lekktu@gmail.com>
> 
> === modified file 'src/msdos.c'
> --- src/msdos.c	2012-08-21 10:21:04 +0000
> +++ src/msdos.c	2012-08-31 03:06:13 +0000
> @@ -4215,26 +4215,9 @@
>  }
>  #endif
>  
> -#ifdef abort
> -#undef abort
> -void
> -dos_abort (char *file, int line)
> -{
> -  char buffer1[200], buffer2[400];
> -  int i, j;
> -
> -  sprintf (buffer1, "<EMACS FATAL ERROR IN %s LINE %d>", file, line);
> -  for (i = j = 0; buffer1[i]; i++) {
> -    buffer2[j++] = buffer1[i];
> -    buffer2[j++] = 0x70;
> -  }
> -  dosmemput (buffer2, j, (int)ScreenPrimary);
> -  ScreenSetCursor (2, 0);
> -  abort ();
> -}
> -#else
> -void
> -abort (void)
> +#ifdef HAVE_NTGUI       <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> +void
> +emacs_abort (void)
>  {
>    dos_ttcooked ();
>    ScreenSetCursor (10, 0);

The line marked above is wrong: code on msdos.c has no relation
whatsoever to the Windows build.