top: refactor the 'scroll coordinates' message support

This patch is simply preparation for upcoming vertical
scrolling enhancements. With those changes, it will be
impossible to predict what the beginning task position
should be at the time the message is currently issued.

This patch will allow such a message to be shown after
the individual windows' tasks have all been displayed.

Signed-off-by: Jim Warner <james.warner@comcast.net>

top/top.h

@@ -696,8 +696,8 @@ typedef struct WIN_t {
 //atic void          capsmk (WIN_t *q);
 //atic void          show_msg (const char *str);
 //atic int           show_pmt (const char *str);
+//atic void          show_scroll (void);
 //atic void          show_special (int interact, const char *glob);
-//atic void          updt_scroll_msg (void);
 /*------  Low Level Memory/Keyboard/File I/O support  --------------------*/
 //atic void         *alloc_c (size_t num);
 //atic void         *alloc_r (void *ptr, size_t num);