[cairo] non-ascii output

[Evan Martin]

cairo_show_text() accepts my UTF-8 strings (and sets an error if I
give it malformed strings) but doesn't actually display characters
when they're not the standard ASCII characters.

I thought cairo used fontconfig?  Is there still a layer missing?  I'm
passing names like "monospace" and "sans-serif" to
cairo_select_face(), and GNOME has no trouble showing these characters
in my terminal ("Monospace"), the character map ("Sans"), etc.