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MFC r201512: Modernize scandir(3) and alphasort(3) interfaces according to the IEEE Std 1003.1-2008. MFC r201602: Move scandir(3) and alphasort(3) into XSI namespace. MFC r201604: Use thunks to adapt alphasort-like interface to the comparision function required by qsort() and qsort_r(). MFC r202556 (by ache): Use strcoll() in opendir() and alphasort(). Remove some comments. MFC r202572 (by ache): Revert to using strcmp() for opendir(). MFC r202677 (by ache): Style. MFC r202679 (by ache): Style: rename internal function to opendir_compar(). MFC r202691 (by ache): For alphasort(3) add reference to strcoll(3). MFC r202693 (by ache): Style: reword comment.