[Rd] Building R on Windows: mkdir of Rtools creates directories with read-only permissions [WEIRD]

[C]

With reference to the issue first reported by Henrik Bengtsson (see
https://stat.ethz.ch/pipermail/r-devel/2014-January/068184.html), I would
like to report that I am experiencing the very same problem when building R
3.1.2 on Windows platform. Fortunately, the same workaround devised by
Henrik works in my case too.
I am using Windows 7 x64 with NTFS.

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