Implement mouse cursor

Signed-off-by: Vojtech Bocek <vbocek@gmail.com>

Change-Id: I66d6db7b3ed9cca50b469d125b36224332e06913
diff --git a/minuitwrp/minui.h b/minuitwrp/minui.h
index 5f02d4a..bbdfdfb 100644
--- a/minuitwrp/minui.h
+++ b/minuitwrp/minui.h
@@ -58,6 +58,7 @@
 int ev_init(void);
 void ev_exit(void);
 int ev_get(struct input_event *ev, unsigned dont_wait);
+int ev_has_mouse(void);
 
 // Resources