lib: drop heuristic IPv6 address recognition

* command.c: (cmd_ipv6_match) Drop IPv6 address recognition
  heuristics and solely rely on inet_pton, because strings
  like "abcd" were mistaken for IPv6 addresses.
  This affects e.g. the command "neighbour WORD peer-group",
  which won't work with words consisting of up to 4 characters
  between 'a' and 'f' and digits.

From: Roman Hoog Antink <rha@open.ch>
[full delete instead of #if 0]
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/lib/command.c b/lib/command.c
index e62a7a7..4d95e92 100644
--- a/lib/command.c
+++ b/lib/command.c
@@ -868,86 +868,7 @@
   if (ret == 1)
     return exact_match;
 
-  while (*str != '\0')
-    {
-      switch (state)
-	{
-	case STATE_START:
-	  if (*str == ':')
-	    {
-	      if (*(str + 1) != ':' && *(str + 1) != '\0')
-		return no_match;
-     	      colons--;
-	      state = STATE_COLON;
-	    }
-	  else
-	    {
-	      sp = str;
-	      state = STATE_ADDR;
-	    }
-
-	  continue;
-	case STATE_COLON:
-	  colons++;
-	  if (*(str + 1) == ':')
-	    state = STATE_DOUBLE;
-	  else
-	    {
-	      sp = str + 1;
-	      state = STATE_ADDR;
-	    }
-	  break;
-	case STATE_DOUBLE:
-	  if (double_colon)
-	    return no_match;
-
-	  if (*(str + 1) == ':')
-	    return no_match;
-	  else
-	    {
-	      if (*(str + 1) != '\0')
-		colons++;
-	      sp = str + 1;
-	      state = STATE_ADDR;
-	    }
-
-	  double_colon++;
-	  nums++;
-	  break;
-	case STATE_ADDR:
-	  if (*(str + 1) == ':' || *(str + 1) == '\0')
-	    {
-	      if (str - sp > 3)
-		return no_match;
-
-	      nums++;
-	      state = STATE_COLON;
-	    }
-	  if (*(str + 1) == '.')
-	    state = STATE_DOT;
-	  break;
-	case STATE_DOT:
-	  state = STATE_ADDR;
-	  break;
-	default:
-	  break;
-	}
-
-      if (nums > 8)
-	return no_match;
-
-      if (colons > 7)
-	return no_match;
-
-      str++;
-    }
-
-#if 0
-  if (nums < 11)
-    return partly_match;
-#endif /* 0 */
-
-  return exact_match;
+  return no_match;
 }
 
 static enum match_type