cmake HAVE_PTHREAD_SETNAME_DARWIN examples

fluent/fluent-bit lib/librdkafka-2.10.1/packaging/cmake/try_compile/rdkafka_setup.cmake :27 

try_compile(
    HAVE_PTHREAD_SETNAME_DARWIN
    "${CMAKE_CURRENT_BINARY_DIR}/try_compile"
    "${TRYCOMPILE_SRC_DIR}/pthread_setname_darwin_test.c"
    COMPILE_DEFINITIONS "-D_DARWIN_C_SOURCE"
    LINK_LIBRARIES "-lpthread"
)