Report locked status to cthulhu. Should prevent some of the weirdness with the screen reader thinking it's in a different window.

include/accessibility_feedback.h

@@ -1,6 +1,8 @@
 #ifndef _ACCESSIBILITY_FEEDBACK_H
 #define _ACCESSIBILITY_FEEDBACK_H
 
+#include <stdbool.h>
+
 typedef enum {
     ACCESSIBILITY_SCREEN_LOCKED = 0,
     ACCESSIBILITY_ENTER_PASSWORD,
@@ -17,7 +19,7 @@ typedef enum {
     ACCESSIBILITY_NUM_LOCK_OFF,
 } accessibility_feedback_t;
 
-void accessibility_feedback_start(int inherited_xcb_fd);
+bool accessibility_feedback_start(int inherited_xcb_fd);
 void accessibility_feedback_notify(accessibility_feedback_t feedback);
 
 #endif