vi-backward-kill-word fix

[Zefram <A.Main@xxxxxxxxxxxxxxxxx>]

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The patch below fixes a bug in vi-backward-kill-word, that it would
delete past the beginning of the line, which it shouldn't.

 -zefram

      *** 1.1	1995/07/21 20:20:54
      --- Src/zle_word.c	1995/07/23 04:41:44
      ***************
      *** 248,254 ****
        void
        vibackwardkillword(void)
        {
      !     int x = cs;
        
            if (mult < 0) {
        	feep();
      --- 248,254 ----
        void
        vibackwardkillword(void)
        {
      !     int x = cs, lim = (viinsbegin > findbol()) ? viinsbegin : findbol();
        
            if (mult < 0) {
        	feep();
      ***************
      *** 256,276 ****
            }
        /* this taken from "vibackwardword" */
            while (mult--) {
      ! 	while ((x > viinsbegin) && iblank(line[x - 1]))
        	    x--;
        	if (iident(line[x - 1]))
      ! 	    while ((x > viinsbegin) && iident(line[x - 1]))
        		x--;
        	else
      ! 	    while ((x > viinsbegin) && !iident(line[x - 1]) && !iblank(line[x - 1]))
        		x--;
            }
      - /*
      -         while (mult--) {
      -                 while ( (x > viinsbegin) && (iwordsep(line[x-1]))) x--;
      -                 while ( (x > viinsbegin) && (!iwordsep(line[x-1]))) x--;
      -         }
      -         */
            backkill(cs - x, 1);
        }
        
      --- 256,270 ----
            }
        /* this taken from "vibackwardword" */
            while (mult--) {
      ! 	while ((x > lim) && iblank(line[x - 1]))
        	    x--;
        	if (iident(line[x - 1]))
      ! 	    while ((x > lim) && iident(line[x - 1]))
        		x--;
        	else
      ! 	    while ((x > lim) && !iident(line[x - 1]) && !iblank(line[x - 1]))
        		x--;
            }
            backkill(cs - x, 1);
        }
        

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