cmake HAVE_PCAP_SET_PARSER_DEBUG examples

CTSRD-CHERI/cheribsd contrib/tcpdump/CMakeLists.txt :937 

check_function_exists(pcap_set_parser_debug HAVE_PCAP_SET_PARSER_DEBUG)

CTSRD-CHERI/cheribsd contrib/tcpdump/CMakeLists.txt :944 

endif(NOT HAVE_PCAP_SET_PARSER_DEBUG)