Revert "topl.c globals moved to instance_globals."

This reverts commit b384223e1b.

win/tty/topl.c

@@ -648,6 +648,9 @@ boolean restoring_msghist;
 {
     static boolean initd = FALSE;
     int idx;
+#ifdef DUMPLOG
+    extern unsigned saved_pline_index; /* pline.c */
+#endif
 
     if (restoring_msghist && !initd) {
         /* we're restoring history from the previous session, but new
@@ -659,7 +662,7 @@ boolean restoring_msghist;
         initd = TRUE;
 #ifdef DUMPLOG
         /* this suffices; there's no need to scrub saved_pline[] pointers */
-        g.saved_pline_index = 0;
+        saved_pline_index = 0;
 #endif
     }