xcb: Fix for PDF operators with RENDER 0.11

RENDER 0.11 added PDF operators and the cairo-xcb backend is already prepared
for handling them. However, it doesn't actually handle them.

If you used such an operator with RENDER 0.11, _operator_is_supported() would
return TRUE, but later on an ASSERT_NOT_REACHED in _render_operator() is hit.

Signed-off-by: Uli Schlachter <psychon@znc.in>
1 file changed