change the type of update_buffer_size from long long unsigned int to uint64_t.
change the type of update_buffer_size from long long unsigned int to uint64_t.

groonga/groonga,naoa/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,myokoym/groonga,cosmo0920/groonga,kenhys/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,kenhys/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,redfigure/groonga,kenhys/groonga,naoa/groonga,komainu8/groonga,redfigure/groonga,komainu8/groonga,hiroyuki-sato/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,cosmo0920/groonga,myokoym/groonga,redfigure/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,myokoym/groonga,kenhys/groonga,naoa/groonga,naoa/groonga,redfigure/groonga,naoa/groonga,redfigure/groonga,redfigure/groonga,cosmo0920/groonga,naoa/groonga,myokoym/groonga,naoa/groonga,groonga/groonga,groonga/groonga,groonga/groonga,kenhys/groonga,hiroyuki-sato/groonga,komainu8/groonga,naoa/groonga,komainu8/groonga,myokoym/groonga,komainu8/groonga,komainu8/groonga,hiroyuki-sato/groonga,groonga/groonga,groonga/groonga,myokoym/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,groonga/groonga,redfigure/groonga,komainu8/groonga,komainu8/groonga,redfigure/groonga,myokoym/groonga,kenhys/groonga,myokoym/groonga