Disable lmdb support for ppc64le
    
    New tests added in 2.1.3 fails on ppc64l4
    It failed in ldb_connect
    
    (gdb) l
    2166            }
    2167            ldb_module_set_private(ldb_kv->module, ldb_kv);
    2168            talloc_steal(ldb_kv->module, ldb_kv);
    2169
    2170            if (ldb_kv_cache_load(ldb_kv->module) != 0) {
    2171                    ldb_asprintf_errstring(ldb, "Unable to load ltdb cache "
    2172                                           "records for backend '%s'", name);
    2173                    talloc_free(ldb_kv->module);
    2174                    return LDB_ERR_OPERATIONS_ERROR;
    2175            }
    (gdb) bt
     #0  ldb_kv_init_store (ldb_kv=0x10003f5e0, name=0x7ffff7064bc0 "ldb_mdb backend", ldb=0x10003f3b0, options=0x7fffffffdee8, _module=0x10003f3b0) at ../../ldb_key_value/ldb_kv.c:2171
     #1  0x00007ffff7063f70 in lmdb_connect (ldb=0x10003f3b0, url=<optimized out>, flags=<optimized out>, options=0x7fffffffdee8, _module=0x10003f3b0) at ../../ldb_mdb/ldb_mdb.c:1141
     #2  0x00007ffff7f1bc04 in ldb_module_connect_backend (ldb=0x10003f3b0, url=0x100038fd0 "mdb://lmdb_free_list_test.ldb", options=0x7fffffffdee8, backend_module=0x10003f3b0)
         at ../../common/ldb_modules.c:217
     #3  0x00007ffff7f451d0 in ldb_connect (ldb=0x10003f3b0, url=0x100038fd0 "mdb://lmdb_free_list_test.ldb", flags=<optimized out>, options=0x7fffffffdee8) at ../../common/ldb.c:269
     #4  0x0000000100002c44 in setup (state=0x1000302b0) at ../../tests/ldb_lmdb_free_list_test.c:170
     #5  0x00007ffff7e67da8 in cmocka_run_one_test_or_fixture () from /lib64/libcmocka.so.0
     #6  0x00007ffff7e68490 in _cmocka_run_group_tests () from /lib64/libcmocka.so.0
     #7  0x0000000100001478 in main (argc=<optimized out>, argv=<optimized out>) at ../../tests/ldb_lmdb_free_list_test.c:666
    
    sh-5.0# ./bin/ldb_lmdb_free_list_test
    [==========] Running 3 test(s).
    [ RUN      ] test_free_list_no_read_lock
    Could not run test: 0x1 != 0
    [   LINE   ] --- ../../tests/ldb_lmdb_free_list_test.c:171: error: Failure!Test setup failed
    [  ERROR   ] test_free_list_no_read_lock
    Failed to connect to 'mdb://lmdb_free_list_test.ldb' with backend 'mdb': Unable to load ltdb cache records for backend 'ldb_mdb backend'[ RUN      ] test_free_list_read_lock
    Could not run test: 0x1 != 0
    [   LINE   ] --- ../../tests/ldb_lmdb_free_list_test.c:171: error: Failure!Test setup failed
    [  ERROR   ] test_free_list_read_lock
    Failed to connect to 'mdb://lmdb_free_list_test.ldb' with backend 'mdb': Unable to load ltdb cache records for backend 'ldb_mdb backend'[ RUN      ] test_free_list_stale_reader
    Could not run test: 0x1 != 0
    [   LINE   ] --- ../../tests/ldb_lmdb_free_list_test.c:171: error: Failure!Test setup failed
    [  ERROR   ] test_free_list_stale_reader
    Failed to connect to 'mdb://lmdb_free_list_test.ldb' with backend 'mdb': Unable to load ltdb cache records for backend 'ldb_mdb backend'[==========] 3 test(s) run.
    [  PASSED  ] 0 test(s).