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Attached patch modifies the following function to emit a DeprecationWarning:
 * PyUnicode_GET_SIZE() (and so PyUnicode_GET_DATA_SIZE())
 * PyUnicode_AS_UNICODE()
 * PyUnicode_AsUnicodeAndSize() (and so PyUnicode_AsUnicode())
 * PyUnicode_FromUnicode()
PyUnicode_GET_SIZE() macro is converted to a function.
The patch adds PyUnicode_AsWideCharAndSize() because PyUnicode_AsUnicodeAndSize() is deprecated and it is still useful to convert a Unicode string to wchar_t* without having to care of freeing the memory.
The patch changes tests to ignore DeprecationWarning.
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"PyUnicode_AsWideCharAndSize" name is maybe confusing because "PyUnicode_AsWideChar" exists, whereas PyUnicode_AsWideChar() requires to free explicitly the memory.
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PyUnicode_AsUnicodeAndSize() should maybe fail with an error if the string kind is not PyUnicode_WCHAR_KIND.
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The CJK codecs should be modified to use the new Unicode API before applying this patch, or test_codecs (and other tests using CJK codecs) would fail with python -Werror.