add: Drop syntax deprecated in 4.3.29

Deprecated in commit 373f20a: argument "new".

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>

src/lib/commands/add.c

@@ -91,10 +91,6 @@ add(void)
     case 'v':
 	stat = STAT_VIS;
 	break;
-    case 'n':
-	pr("Argument 'new' is deprecated and will go away in a future release.\n"
-	   "Use 'player' instead.\n");
-	/* fall through */
     case 'p':
 	stat = STAT_NEW;
 	break;