[issue2799] Remove _PyUnicode_AsString(), rework _PyUnicode_AsStringAndSize(), add PyUnicode_AsChar()

[STINNER Victor]

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

The PEP 393 changed the API:

#define _PyUnicode_AsString PyUnicode_AsUTF8
#define _PyUnicode_AsStringAndSize PyUnicode_AsUTF8AndSize

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<http://bugs.python.org/issue2799>
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