fix placeholder implementations in case H2O_USE_EBPF_MAP is not defined
fix placeholder implementations in case H2O_USE_EBPF_MAP is not defined

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