patch 8.0.0873: in terminal cannot use CTRL-\ CTRL-N to start Visual mode

Problem:    In a terminal window cannot use CTRL-\ CTRL-N to start Visual
            mode.
Solution:   After CTRL-\ CTRL-N enter Terminal-Normal mode for one command.
diff --git a/src/proto/terminal.pro b/src/proto/terminal.pro
index b6c27ed..fbd17ed 100644
--- a/src/proto/terminal.pro
+++ b/src/proto/terminal.pro
@@ -6,7 +6,7 @@
 int term_in_terminal_mode(void);
 void term_leave_terminal_mode(void);
 int send_keys_to_term(term_T *term, int c, int typed);
-int term_use_loop(void);
+int term_use_loop(int once);
 int terminal_loop(void);
 void term_job_ended(job_T *job);
 void term_channel_closed(channel_T *ch);