Cleanup: Remove a startup message

The GCC __atomic_ functions were removed already in
commit 2b47f8ff,
and starting with MariaDB Server 10.4, InnoDB relies mostly
on C++11 std::atomic.

storage/innobase/srv/srv0start.cc

@@ -1160,11 +1160,6 @@ dberr_t srv_start(bool create_new_db)
 	ib::info() << "!!!!!!!! UNIV_IBUF_DEBUG switched on !!!!!!!!!";
 #endif
 
-#ifdef _WIN32
-	ib::info() << "Mutexes and rw_locks use Windows interlocked functions";
-#else
-	ib::info() << "Mutexes and rw_locks use GCC atomic builtins";
-#endif
 	ib::info() << MUTEX_TYPE;
 
 	ib::info() << "Compressed tables use zlib " ZLIB_VERSION