Fix cairo-xlib-xcb compilation

This is broken since:

commit b1192be
Author: Adrian Johnson <ajohnson@redneon.com>
Date:   Mon Sep 21 21:35:05 2015 +0930

    Don't cull very thin lines on vector surfaces

    On vector surfaces, use a minimum line width when calculating extents.

    Bug 77298

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

src/cairo-xlib-xcb-surface.c

@@ -447,7 +447,8 @@ _cairo_xlib_xcb_surface_create (void *dpy,
     _cairo_surface_init (&surface->base,
 			 &_cairo_xlib_xcb_surface_backend,
 			 _cairo_xlib_xcb_device_create (dpy, xcb->device),
-			 xcb->content);
+			 xcb->content,
+			 FALSE); /* is_vector */
 
     /* _cairo_surface_init() got another reference to the device, drop ours */
     cairo_device_destroy (surface->base.device);