patch 8.0.0918: cannot get terminal window cursor shape or attributes

Problem:    Cannot get terminal window cursor shape or attributes.
Solution:   Support cursor shape, attributes and color.
diff --git a/src/proto/ui.pro b/src/proto/ui.pro
index 47c0fef..4cf87b4 100644
--- a/src/proto/ui.pro
+++ b/src/proto/ui.pro
@@ -47,6 +47,7 @@
 int read_from_input_buf(char_u *buf, long maxlen);
 void fill_input_buf(int exit_on_error);
 void read_error_exit(void);
+void ui_cursor_shape_forced(int forced);
 void ui_cursor_shape(void);
 int check_col(int col);
 int check_row(int row);