MDEV-32374 Improve lsn_lock. Also use futex-like on Windows

Upon further benchmarking, it turns out srw_mutex performs overall
slightly better with WaitOnAddress than CRITICAL_SECTION.

storage/innobase/include/log0log.h

@@ -180,9 +180,6 @@ struct log_t
   /* On ARM, we do more spinning */
   typedef srw_spin_lock log_rwlock;
   typedef pthread_mutex_wrapper<true> log_lsn_lock;
-#elif defined _WIN32
-  typedef srw_lock log_rwlock;
-  typedef pthread_mutex_wrapper<false> log_lsn_lock;
 #else
   typedef srw_lock log_rwlock;
   typedef srw_mutex log_lsn_lock;