gh-116608: Ignore UTF-16 BOM in importlib.resources._functional tests #117569
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To test the
errors
argument, we read a UTF-16 file as UTF-8 with "backslashreplace" error handling. However, the utf-16 codec adds an endian-specific byte-order mark, so on big-endian machines the expectation doesn't match the test file (which was saved on a little-endian machine).Use endswith to ignore the BOM.