Fix some file-name-case-insensitive glitches
* src/fileio.c (file_name_directory): New static function, broken out of Ffile_name_directory. (file_name_case_insensitive_err, Ffile_writable_p, Fdo_auto_save): Use it. (file_name_case_insensitive_err): Rename from file_name_case_insensitive_p. Accept an unencoded Lisp_Object rather than an encoded char *, so that platforms other than Cygwin and macOS need not encode the file name. Return an int -1, 0, errno rather than a bool (setting errno if false), so that the caller can distinguish an error from false. All callers changed. (Ffile_name_case_insensitive_p): Don’t issue system calls on platforms other than Cygwin and macOS. Fix bug that broke the attempt to move up the filesystem tree (it moved up only one level).
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