Issue #9979: Use PyUnicode_AsWideCharString() for _locale.strcoll()
Issue #9979: Use PyUnicode_AsWideCharString() for _locale.strcoll()

It simplifies the code and prepare the surrogates support.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator