Use h2o_memcpy instead of memcpy in `APPEND`
Use h2o_memcpy instead of memcpy in `APPEND`

cwyang/h2o,yannick/h2o,cwyang/h2o,devnexen/h2o,devnexen/h2o,devnexen/h2o,devnexen/h2o,yannick/h2o,yannick/h2o,h2o/h2o,h2o/h2o,cwyang/h2o,devnexen/h2o,deweerdt/h2o,h2o/h2o,deweerdt/h2o,deweerdt/h2o,cwyang/h2o,yannick/h2o,deweerdt/h2o,deweerdt/h2o,yannick/h2o,deweerdt/h2o,h2o/h2o,devnexen/h2o,h2o/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,cwyang/h2o,h2o/h2o,cwyang/h2o,h2o/h2o,yannick/h2o,devnexen/h2o,deweerdt/h2o,devnexen/h2o,deweerdt/h2o,deweerdt/h2o,yannick/h2o,cwyang/h2o,h2o/h2o,yannick/h2o,devnexen/h2o