cmake HAVE_ETHER_HOSTTON examples

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :753 

check_function_exists(ether_hostton HAVE_ETHER_HOSTTON)

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :1110 

check_function_exists(ether_hostton HAVE_ETHER_HOSTTON)