cmake HAS_MEMSET_S examples

KeystoneHQ/keystone3-firmware external/cryptoauthlib/lib/CMakeLists.txt :72 

check_symbol_exists(memset_s "string.h" HAS_MEMSET_S)

KeystoneHQ/keystone3-firmware external/cryptoauthlib/lib/CMakeLists.txt :365 

endif(HAS_MEMSET_S)