cmake HAVE_DAG_GET_ERF_TYPES examples

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :2566 

check_function_exists(dag_get_erf_types HAVE_DAG_GET_ERF_TYPES)

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :1749 

check_function_exists(dag_get_erf_types HAVE_DAG_GET_ERF_TYPES)