x11: explicitly enable Dri2

On some systems, the X server will send dri2 events when enabling
opengl. Without telling the rust xcb crate that they might arrive, it
may panic.

refs: https://github.com/rust-x-bindings/rust-xcb/issues/204
refs: https://github.com/wez/wezterm/issues/2559

window/src/os/x11/connection.rs

@@ -502,6 +502,7 @@ impl XConnection {
                 xcb::Extension::Present,
                 xcb::Extension::RandR,
                 xcb::Extension::Render,
+                xcb::Extension::Dri2,
             ],
         )?;
         conn.set_event_queue_owner(xcb::EventQueueOwner::Xcb);