one more ndb-isolating fix

acinclude.m4

@@ -1422,6 +1422,7 @@ AC_DEFUN([MYSQL_CHECK_NDBCLUSTER], [
       ;;
   esac
 
+  AM_CONDITIONAL(HAVE_NDBCLUSTER_DB, test "have_ndbcluster" = "yes")
   AC_SUBST(ndbcluster_includes)
   AC_SUBST(ndbcluster_libs)
   AC_SUBST(ndbcluster_system_libs)

mysql-test/Makefile.am

@@ -17,7 +17,9 @@
 
 ## Process this file with automake to create Makefile.in
 
+if HAVE_NDBCLUSTER_DB
 SUBDIRS = ndb
+endif
 
 benchdir_root=		$(prefix)
 testdir =	        $(benchdir_root)/mysql-test