cmake HAVE_GTHREAD examples

mysql/mysql-proxy CMakeLists.txt :211

CHECK_LIBRARY_EXISTS(gthread-2.0 g_thread_init "${GTHREAD_LIBRARY_DIRS}" HAVE_GTHREAD)

session-replay-tools/cetus CMakeLists.txt :179

CHECK_LIBRARY_EXISTS(gthread-2.0 g_thread_init "${GTHREAD_LIBRARY_DIRS}" HAVE_GTHREAD)