cmake HAVE_STRUCT_MSGHDR_MSG_FLAGS examples

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :2698 

check_struct_has_member("struct msghdr" msg_flags "ftmacros.h;sys/socket.h" HAVE_STRUCT_MSGHDR_MSG_FLAGS)

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :1878 

check_struct_has_member("struct msghdr" msg_flags "ftmacros.h;sys/socket.h"
                          HAVE_STRUCT_MSGHDR_MSG_FLAGS)