support to supply FLATBUFFERS_ENCRYPTION_XXTEA_KEY
support to supply FLATBUFFERS_ENCRYPTION_XXTEA_KEY

kiyoto-suzuki/flatbuffers,kiyoto-suzuki/flatbuffers,kiyoto-suzuki/flatbuffers,kiyoto-suzuki/flatbuffers,kiyoto-suzuki/flatbuffers,kiyoto-suzuki/flatbuffers,kiyoto-suzuki/flatbuffers,kiyoto-suzuki/flatbuffers,kiyoto-suzuki/flatbuffers