cmake HAVE_STRUCT_MSGHDR_MSG_CONTROL examples

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :2697 

check_struct_has_member("struct msghdr" msg_control "ftmacros.h;sys/socket.h" HAVE_STRUCT_MSGHDR_MSG_CONTROL)

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :1876 

check_struct_has_member("struct msghdr" msg_control "ftmacros.h;sys/socket.h"
                          HAVE_STRUCT_MSGHDR_MSG_CONTROL)