cmake HAVE_NET_NIT_H examples

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :1887 

check_include_file(net/nit.h HAVE_NET_NIT_H)

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :1916 

elseif(HAVE_NET_NIT_H)

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :1172 

check_include_file(net/nit.h HAVE_NET_NIT_H)

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :1200 

elseif(HAVE_NET_NIT_H)