The path string returned when nan is imported in node 6 is wrong in some cases

[amatas]

With the method relative('.', __dirname) in include_dirs.js the path isn't got properly when the parent path is in a shared resource (a link to a network resource in the case of windows):

vboxsrv\vagrant\NODE_MODULES\nan (which doesn't exists)

To reproduce this behavior, run the include_dirs.js with node 6 inside of a shared folder of virtualbox, or in a network resource linked to a drive letter.