Move enhance_tip into context and don't show tip if #enhance has been used before

Breaks save and bones compatibility.

include/context.h

@@ -132,6 +132,7 @@ struct context_info {
     boolean botl;        /* partially redo status line */
     boolean botlx;       /* print an entirely new bottom line */
     boolean door_opened; /* set to true if door was opened during test_move */
+    boolean enhance_tip; /* player is informed about #enhance */
     struct dig_info digging;
     struct victual_info victual;
     struct tin_info tin;

include/patchlevel.h

@@ -14,7 +14,7 @@
  * Incrementing EDITLEVEL can be used to force invalidation of old bones
  * and save files.
  */
-#define EDITLEVEL 8
+#define EDITLEVEL 9
 
 #define COPYRIGHT_BANNER_A "NetHack, Copyright 1985-2020"
 #define COPYRIGHT_BANNER_B \

src/weapon.c

@@ -69,17 +69,16 @@ static void
 give_may_advance_msg(skill)
 int skill;
 {
-    static boolean got_enhance_tip = FALSE;
     You_feel("more confident in your %sskills.",
              (skill == P_NONE) ? ""
                  : (skill <= P_LAST_WEAPON) ? "weapon "
                      : (skill <= P_LAST_SPELL) ? "spell casting "
                          : "fighting ");
 
-    if (!got_enhance_tip) {
+    if (!g.context.enhance_tip) {
+        g.context.enhance_tip = TRUE;
         pline("(Use the #enhance command to advance them.)");
     }
-    got_enhance_tip = TRUE;
 }
 
 /* weapon's skill category name for use as generalized description of weapon;
@@ -1168,6 +1167,9 @@ enhance_weapon_skill()
     winid win;
     boolean speedy = FALSE;
 
+    /* player knows about #enhance, don't show tip anymore */
+    g.context.enhance_tip = TRUE;
+
     if (wizard && yn("Advance skills without practice?") == 'y')
         speedy = TRUE;