[issue16444] Use support.TESTFN_UNDECODABLE on UNIX

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Try b'\x81', b'\x98', b'\xae', b'\xd5', b'\xff'. They are undecodable in all 1-byte encodings.

b'\x81' : shift_jis_2004 shift_jis shift_jisx0213 cp869 cp874 cp932 cp1250 cp1252 cp1253 cp1254 cp1255 cp1257 cp1258
b'\x98' : shift_jis_2004 shift_jis shift_jisx0213 cp874 cp932 cp1250 cp1251 cp1253 cp1257
b'\xae' : iso8859-3 iso8859-6 iso8859-7 cp424
b'\xd5' : iso8859-8 cp856 cp857
b'\xff' : hp-roman8 iso8859-6 iso8859-7 iso8859-8 iso8859-11 shift_jis_2004 shift_jis shift_jisx0213 tis-620 cp864 cp874 cp1253 cp1255

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16444>
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