main/ldb: test failures on ppc64le
After upgrading to v2.1.4, ldb has test failures on ppc64le
Failed to connect to 'mdb://lmdb_free_list_test.ldb' with backend 'mdb': Unable to load ltdb cache records for backend 'ldb_mdb backend'
Could not run test: 0x1 != 0
[..]
Could not run test: 0x1 != 0
[ LINE ] --- ../../tests/ldb_lmdb_free_list_test.c:165: error: Failure!Test setup failed
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