cmake find_package(lz4) examples

apache/arrow cpp/cmake_modules/Findlz4Alt.cmake :29 

find_package(lz4 ${find_package_args})

facebook/rocksdb CMakeLists.txt :184 

find_package(lz4 REQUIRED)

microsoft/vcpkg ports/mysql-connector-cpp/cmake-project-include.cmake :32 

find_package(lz4 REQUIRED)