weston-simple-im: Create our own xkb_context

There's no need to use the struct display xkb_context, we can just create
out ow.  This reverts c31288daf1.

clients/weston-simple-im.c

@@ -46,6 +46,7 @@ struct compose_seq {
 struct simple_im {
 	struct input_method *input_method;
 	struct input_method_context *context;
+	struct xkb_context *xkb_context;
 	struct display *display;
 	struct wl_keyboard *keyboard;
 	struct keyboard_input *keyboard_input;
@@ -464,8 +465,14 @@ main(int argc, char *argv[])
 		return -1;
 	}
 
+	simple_im.xkb_context = xkb_context_new(0);
+	if (simple_im.xkb_context == NULL) {
+		fprintf(stderr, "Failed to create XKB context\n");
+		return -1;
+	}
+
 	simple_im.context = NULL;
-	simple_im.keyboard_input = keyboard_input_create(display_get_xkb_context(simple_im.display));
+	simple_im.keyboard_input = keyboard_input_create(simple_im.xkb_context);
 	keyboard_input_set_user_data(simple_im.keyboard_input, &simple_im);
 	keyboard_input_set_key_handler(simple_im.keyboard_input, simple_im_key_handler);
 

clients/window.c

@@ -4024,12 +4024,6 @@ display_get_serial(struct display *display)
 	return display->serial;
 }
 
-struct xkb_context *
-display_get_xkb_context(struct display *display)
-{
-	return display->xkb_context;
-}
-
 EGLDisplay
 display_get_egl_display(struct display *d)
 {

clients/window.h

@@ -79,9 +79,6 @@ display_get_output(struct display *display);
 uint32_t
 display_get_serial(struct display *display);
 
-struct xkb_context *
-display_get_xkb_context(struct display *display);
-
 typedef void (*display_global_handler_t)(struct display *display,
 					 uint32_t name,
 					 const char *interface,