set_display (Imlib2::Context)

    /*
     * Set the current X11 Display.
     *
     * Note: This method is not available unless Imlib2-Ruby was compiled
     * with X11 support.  You can check the constant Imlib2::X11_SUPPORT to
     * see if X11 support is available.
     *
     * Examples:
     *   context.set_display display
     *   context.display = display
     *
     */
    static VALUE ctx_set_display(VALUE self, VALUE display) {