patch 8.0.0953: get "no write since last change" error in terminal window

Problem:    Get "no write since last change" error in terminal window.
Solution:   Use another message when closing a terminal window. Make ":quit!"
            also end the job.
diff --git a/src/proto/buffer.pro b/src/proto/buffer.pro
index d70981d..485eb02 100644
--- a/src/proto/buffer.pro
+++ b/src/proto/buffer.pro
@@ -13,6 +13,8 @@
 void set_curbuf(buf_T *buf, int action);
 void enter_buffer(buf_T *buf);
 void do_autochdir(void);
+void no_write_message(void);
+void no_write_message_nobang(void);
 buf_T *buflist_new(char_u *ffname, char_u *sfname, linenr_T lnum, int flags);
 void free_buf_options(buf_T *buf, int free_p_ff);
 int buflist_getfile(int n, linenr_T lnum, int options, int forceit);