cmake Librtmp examples

mysql/mysql-server extra/curl/curl-8.14.1/CMakeLists.txt :1531 

find_package(Librtmp REQUIRED)

percona/percona-xtradb-cluster extra/curl/curl-8.12.1/CMakeLists.txt :1456 

find_package(Librtmp REQUIRED)

percona/percona-server extra/curl/curl-8.14.1/CMakeLists.txt :1531 

find_package(Librtmp REQUIRED)

sems-server/sems CMakeLists.txt :294 

FIND_PACKAGE(Librtmp)