Hackey fix for FileSys tests failing on OS X due to Unicode normalisation #6221
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The test fails because OS X normalises the Unicode file name given and creates a file whose filename is equivalent according to Unicode, but byte by byte it differs from the original.
This hackey fix is to simply use the normalised form that OS X converts to.
The proper solution is to support Unicode equivalence e.g. as
Std.isUnicodeEquivalent(), and edit this test to check both Unicode forms.