cmake EVENT__HAVE_DECL_CTL_KERN examples

monkey/monkey mk_core/deps/libevent/CMakeLists.txt :415 

CHECK_SYMBOL_EXISTS(CTL_KERN sys/sysctl.h EVENT__HAVE_DECL_CTL_KERN)

fluent/fluent-bit lib/monkey/mk_core/deps/libevent/CMakeLists.txt :415 

CHECK_SYMBOL_EXISTS(CTL_KERN sys/sysctl.h EVENT__HAVE_DECL_CTL_KERN)