patch 8.1.2195: Vim does not exit when the terminal window is last window

Problem:    Vim does not exit when closing a terminal window and it is the
            last window.
Solution:   Exit Vim if the closed terminal window is the last one.
            (closes #4539)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 1d04769..d9fe7de 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -87,7 +87,6 @@
 static char_u	*repl_cmdline(exarg_T *eap, char_u *src, int srclen, char_u *repl, char_u **cmdlinep);
 static void	ex_highlight(exarg_T *eap);
 static void	ex_colorscheme(exarg_T *eap);
-static void	ex_quit(exarg_T *eap);
 static void	ex_cquit(exarg_T *eap);
 static void	ex_quit_all(exarg_T *eap);
 static void	ex_close(exarg_T *eap);
@@ -4842,8 +4841,9 @@
 /*
  * ":quit": quit current window, quit Vim if the last window is closed.
  * ":{nr}quit": quit window {nr}
+ * Also used when closing a terminal window that's the last one.
  */
-    static void
+    void
 ex_quit(exarg_T *eap)
 {
     win_T	*wp;