Added FLATBUFFERS_FOUND to FlatBufferConfig.cmake
Added FLATBUFFERS_FOUND to FlatBufferConfig.cmake

This is the casing that some projects expect downstream (e.g. zeq).

rdumusc/flatbuffers,BlueBrain/flatbuffers,rdumusc/flatbuffers,BlueBrain/flatbuffers,BlueBrain/flatbuffers,BlueBrain/flatbuffers,rdumusc/flatbuffers,BlueBrain/flatbuffers,rdumusc/flatbuffers,rdumusc/flatbuffers,BlueBrain/flatbuffers,rdumusc/flatbuffers