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In commit cf552f58 we removed the
function os_normalize_path() and started writing file names to the
InnoDB redo log always using the same path separator, even on
Microsoft Windows.

In commit 685d958e the ability to
recover from previous log file formats was removed. Thus, the log file
can never contain the Microsoft specific path separator and the
conversion code can be removed.

Note: *.isl files may still contain Microsoft Windows path separators.
They will be replaced with standard ones in read_link_file().