{fore,back}del() fix for use in completion

[Zefram <A.Main@xxxxxxxxxxxxxxxxx>]

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When menu completing in beta18, each time the menu completion
reaches a completion with no special suffix, the last character
in the buffer gets duplicated.  This is because the foredel() and
backdel() functions are used in the completion code, but they now
do not expect the buffer to be NUL terminated.  The patch below
fixes this: they always move line[ll], which is harmless if the
buffer is not NUL terminated, because it's always big enough.

 -zefram

      Index: Src/zle_utils.c
      *** zle_utils.c	1996/05/18 06:52:44	1.5
      --- zle_utils.c	1996/05/23 13:07:53
      ***************
      *** 152,158 ****
        {
            int i = (cs -= ct);
        
      !     while (i + ct < ll) {
        	line[i] = line[i + ct];
        	i++;
            }
      --- 152,158 ----
        {
            int i = (cs -= ct);
        
      !     while (i + ct <= ll) {
        	line[i] = line[i + ct];
        	i++;
            }
      ***************
      *** 165,171 ****
        {
            int i = cs;
        
      !     while (i + ct < ll) {
        	line[i] = line[i + ct];
        	i++;
            }
      --- 165,171 ----
        {
            int i = cs;
        
      !     while (i + ct <= ll) {
        	line[i] = line[i + ct];
        	i++;
            }

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