[ccache] base_dir and symbolic links

[Andreas Wettstein]

> Seems like a pretty niche use case, but if you can come up with a
> patch that doesn't break too much of current behaviour - why not.

Thank you for considering it.  A patch is in the attachment.

> Worst case, it could be an option (that defaulted to false) ?

I would not consider this the worst case.  For me, it would be still
more convenient than keeping my own modified version around.

Andreas

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