non-debug build should not cause ma_test_all-t to always fail:

make ma_test_recovery.pl return 0 if it skips itself.


storage/maria/unittest/ma_test_recovery.pl:
  non-debug build should not cause ma_test_all-t to always fail

storage/maria/unittest/ma_test_recovery.pl

@@ -72,7 +72,11 @@ sub main
   {
     print "Recovery tests require compilation with DBUG\n";
     print "Aborting test\n";
-    exit(1);
+    # In the future, we will not abort but use maria_chk --zerofill-keep-lsn
+    # for comparisons in non-debug builds.
+    # For now we just skip the test, pretending it passed (nothing is
+    # alarming).
+    exit(0);
   }
 
   # To not flood the screen, we redirect all the commands below to a text file