tex/build and tex/tikz treated properly in tarball

When the project is being re-built from the tarball (not the Git
repository), the 'tex/build' and 'tex/tikz' addresses are actual
directories, not symbolic links. In this case, when someone runs './project
configure', it will complain about not being able to delete them (it
assumes they are symbolic links!).

So with this commit, we first check if they are deletable without '-r'. If
so, then they are full directories and we rename them to a backup directory
to allow the rest of the project to continue building a link there.

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