cmake HAVE_SENDMMSG examples

percona/percona-server extra/curl/curl-8.14.1/CMakeLists.txt :1771 

check_function_exists("sendmmsg"      HAVE_SENDMMSG)

logicalclocks/rondb extra/curl/curl-8.11.1/CMakeLists.txt :1571 

check_function_exists("sendmmsg"      HAVE_SENDMMSG)

ultravideo/uvgRTP CMakeLists.txt :220 

check_cxx_symbol_exists(sendmmsg sys/socket.h HAVE_SENDMMSG)

apache/trafficserver CMakeLists.txt :404 

check_symbol_exists(sendmmsg sys/socket.h HAVE_SENDMMSG)

percona/percona-xtradb-cluster extra/curl/curl-8.12.1/CMakeLists.txt :1709 

check_function_exists("sendmmsg"      HAVE_SENDMMSG)

mysql/mysql-server extra/curl/curl-8.14.1/CMakeLists.txt :1771 

check_function_exists("sendmmsg"      HAVE_SENDMMSG)