Update flatbuffers to b99332e
Update flatbuffers to b99332e

Since flatbuffers/5104 has been merged, it is possible to use
flatbuffers directly without patch. This fix update the flatbuffers
to the latest one.

This fix is related to 36.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io