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MDEV-23076 Misleading "InnoDB: using atomic writes"
As suggested by Vladislav Vaintroub, let us remove misleading and malformatted startup messages. Even if the global variable srv_use_atomic_writes were set, we would still invoke my_test_if_atomic_write() to check if writes are atomic with a particular page size. When using the default innodb_page_size=16k, page writes should be atomic on NTFS when using ROW_FORMAT=COMPRESSED and KEY_BLOCK_SIZE<=4. Disabling srv_use_atomic_writes when innodb_file_per_table=OFF does not make sense, because that is a dynamic parameter. We also correct the documentation string of innodb_use_atomic_writes and remove the duplicate variable innobase_use_atomic_writes.
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