Revert "This function is now useless."

This reverts commit 0871c5c489.

ompi/mca/pml/ob1/pml_ob1.c

@@ -1029,3 +1029,16 @@ clean:
 }
 #endif /* OPAL_ENABLE_FT_CR */
 
+int mca_pml_ob1_com_btl_comp(const void *v1, const void *v2)
+{
+    const mca_pml_ob1_com_btl_t *b1 = (const mca_pml_ob1_com_btl_t *) v1;
+    const mca_pml_ob1_com_btl_t *b2 = (const mca_pml_ob1_com_btl_t *) v2;
+
+    if(b1->bml_btl->btl_weight < b2->bml_btl->btl_weight)
+        return 1;
+    if(b1->bml_btl->btl_weight > b2->bml_btl->btl_weight)
+        return -1;
+
+    return 0;
+}
+