[issue9979] Create PyUnicode_AsWideCharString() function

[STINNER Victor]

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

New version of the patch:
 - fix PyUnicode_AsWideCharString() :-)
 - replace PyUnicode_AsWideChar() by PyUnicode_AsWideCharString() in most functions using PyUnicode_AsWideChar()
 - indicate that PyUnicode_AsWideCharString() raises a MemoryError on error

Keep the call to PyUnicode_AsWideChar() in:
 - Modules/getpath.c because getpath.c uses a global limitation of MAXPATHLEN+1 characters
 - WCharArray_set_value() and U_set() of ctypes because the output buffer size is fixed

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Added file: http://bugs.python.org/file19055/pyunicode_aswidecharstring-2.patch

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