[osg-submissions] vpb::mkdir on windows side

[Jean-Christophe Lombardo]

Hi Robert,

Here is a slight modification to FileUtils / FileUtils.cpp
As far as I know, we cannot create a directory and set its permissions
at once on windows side.
Changes are relative to revision 862 and allow vpb to compile again on windows

regards
-- 
Jean-Christophe Lombardo
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