Fixed to include correct headers in src/data/functional_hash.h.
Fixed to include correct headers in src/data/functional_hash.h.

takei-yuya/pficommon,takei-yuya/pficommon,pfi/pficommon,retrieva/pficommon,pfi/pficommon,retrieva/pficommon,pfi/pficommon,takei-yuya/pficommon,retrieva/pficommon,retrieva/pficommon,takei-yuya/pficommon,pfi/pficommon,retrieva/pficommon