make: unifdef SUN5_0 (defined)

@@ -1701,13 +1701,11 @@
                         result = execute_parallel(line, true);
 #else
                         result = execute_serial(line);
 #endif
                 }
-#if defined(SUN5_0) || defined(HP_UX) || defined(linux)
                 exit_status = 1;
-#endif
                 exit(1);
         }
         /* We actually had to do something this time */
         rewrite_statefile = commands_done = true;
         /*