When adding the return -1 to prevent warnings on some compilers, others

started complaining since it won't be reached... So I removed the call to
abort() and just return -1 instead. abort() was wrong to call anyway since
this is a library!

lib/getdate.y

@@ -722,7 +722,7 @@ ToHour (int Hours, MERIDIAN Meridian)
 	Hours = 0;
       return Hours + 12;
     default:
-      abort ();
+      break; /* used to do abort() here */
     }
   /* NOTREACHED - but make gcc happy! */
   return -1;