title: org-mode export with utf8x instead of utf8
body: <p>All the fancy characters like ∧, ∀, and ∃ don't have codepoints in the <code>utf8</code> inputenc package, but the <code>utf8x</code> does. How do I tell emacs to pass the <code>utf8x</code> option when I generate a pdf via <code>org-export</code>?</p>