windows: use upper() instead of lower() or os.path.normcase()...
windows: use upper() instead of lower() or os.path.normcase()
this patch uses upper() instead of lower() or os.path.normcase() for
case folding on Windows(NTFS), because lower-ing causes problems for
some languages on it.
see below for detail about problem of lower-ing:
https://blogs.msdn.com/b/michkap/archive/2005/01/16/353873.aspx
