plm/base: do not abort when configure'd with --enable-heterogeneous

and a mix of BE/LE is detected

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>

orte/mca/plm/base/plm_base_launch_support.c

@@ -1274,7 +1274,9 @@ void orte_plm_base_daemon_callback(int status, orte_process_name_t* sender,
                 }
                 free(sig);
                 break;
-            } else {
+            }
+#if !OPAL_ENABLE_HETEROGENEOUS_SUPPORT
+              else {
                 /* check if the difference is due to the endianness */
                 ptr = strrchr(sig, ':');
                 ++ptr;
@@ -1290,6 +1292,7 @@ void orte_plm_base_daemon_callback(int status, orte_process_name_t* sender,
                     goto CLEANUP;
                 }
             }
+#endif
         }
 
         if (!found) {