[issue14153] Expose os.device_encoding() at the C level

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> For fd 0, it should be a string if the fd is a tty.

os.device_encoding() returns None on a non-Windows OS without langinfo support.

locale.nl_langinfo(locale.CODESET) may be used in such test. (to check
for nl_langinfo() support?)

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<http://bugs.python.org/issue14153>
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