patch 8.2.2638: cannot write a message to the terminal from the GUI

Problem:    Cannot write a message to the terminal from the GUI.
Solution:   Add :echoconsole and use it in the test runner. (issue #7975)
diff --git a/src/proto/ui.pro b/src/proto/ui.pro
index 5aad9d8..e75be32 100644
--- a/src/proto/ui.pro
+++ b/src/proto/ui.pro
@@ -1,11 +1,11 @@
 /* ui.c */
-void ui_write(char_u *s, int len);
+void ui_write(char_u *s, int len, int console);
 void ui_inchar_undo(char_u *s, int len);
 int ui_inchar(char_u *buf, int maxlen, long wtime, int tb_change_cnt);
 int inchar_loop(char_u *buf, int maxlen, long wtime, int tb_change_cnt, int (*wait_func)(long wtime, int *interrupted, int ignore_input), int (*resize_func)(int check_only));
 int ui_wait_for_chars_or_timer(long wtime, int (*wait_func)(long wtime, int *interrupted, int ignore_input), int *interrupted, int ignore_input);
 int ui_char_avail(void);
-void ui_delay(long msec, int ignoreinput);
+void ui_delay(long msec_arg, int ignoreinput);
 void ui_suspend(void);
 void suspend_shell(void);
 int ui_get_shellsize(void);