cygwin-1.5.19-2: mkdir returns inconsistent errno

[Alex Riesen]

mkdir (also syscall) return "Permission denied" when its argument refers to
a mountpoint  at the top of windows drive (probably also a windows mount,
I haven't tried).
For example:
$ mount d: /d
$ mkdir /
mkdir: cannot create directory `/': File exists
$ mkdir /d
mkdir: cannot create directory `/d': Permission denied
$ mkdir /d/tmp
mkdir: cannot create directory `/d/tmp': File exists

This is highly unexpected, does not match linux behaviour (it returns EEXIST),
and actually breaks git (git clone, creation of pathnames, to be precise).
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