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MDEV-12534 Use atomic operations whenever available
Allow 64-bit atomic operations on 32-bit systems, only relying on HAVE_ATOMIC_BUILTINS_64, disregarding the width of the register file. Define UNIV_WORD_SIZE correctly on all systems, including Windows. In MariaDB 10.0 and 10.1, it was incorrectly defined as 4 on 64-bit Windows. Define HAVE_ATOMIC_BUILTINS_64 on Windows (64-bit atomics are available on both 32-bit and 64-bit Windows platforms; the operations were unnecessarily disabled even on 64-bit Windows). MONITOR_OS_PENDING_READS, MONITOR_OS_PENDING_WRITES: Enable by default. os_file_n_pending_preads, os_file_n_pending_pwrites, os_n_pending_reads, os_n_pending_writes: Remove. Use the monitor counters instead. os_file_count_mutex: Remove. On a system that does not support 64-bit atomics, monitor_mutex will be used instead.
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