removed abort() - sync'd with getdate.y 1.26

lib/getdate.c.cvs

@@ -1756,7 +1756,7 @@ ToHour (Hours, Meridian)
 	Hours = 0;
       return Hours + 12;
     default:
-      abort ();
+      break; /* used to do abort() here */
     }
   /* NOTREACHED - but make gcc happy! */
   return -1;