input method: Initialize the protocol and pretend to handle a few things

src/wayland.h

@@ -3,6 +3,7 @@
 
 #include "wlr-layer-shell-unstable-v1-client-protocol.h"
 #include "virtual-keyboard-unstable-v1-client-protocol.h"
+#include "input-method-unstable-v2-client-protocol.h"
 
 #include <gmodule.h>
 
@@ -10,6 +11,7 @@
 struct squeek_wayland {
     struct zwlr_layer_shell_v1 *layer_shell;
     struct zwp_virtual_keyboard_manager_v1 *virtual_keyboard_manager;
+    struct zwp_input_method_manager_v2 *input_method_manager;
     GPtrArray *outputs; // *wl_output
     struct wl_seat *seat;
 };