Revert change to fht_impl.h.
Revert change to fht_impl.h.

FALCONN-LIB/FALCONN,FALCONN-LIB/FALCONN,ilyaraz/falconn_polygon,FALCONN-LIB/FALCONN,ilyaraz/falconn_polygon,FALCONN-LIB/FALCONN,ilyaraz/falconn_polygon,ilyaraz/falconn_polygon