Qt support for changing 'statuslines' dynamically

Turns out it was nearly as simple as I originally thought.
I just missed one significant detail the first time around.
This leaves DYNAMIC_STATUSLINES as conditionl but now enables
it by default.  Using 'O' to change 'statuslines' from 2 to 3
or vice versa now works for Qt as well as for curses and tty.

win/Qt/qt_main.h

@@ -14,6 +14,11 @@
 #include "qt_kde0.h"
 #endif
 
+// Allow changing 'statuslines:2' to 'statuslines:3' or vice versa
+// while the game is running; deletes and re-creates the status window.
+// [Used in qt_bind.cpp and qt_main.cpp, but not referenced in qt_stat.cpp.]
+#define DYNAMIC_STATUSLINES
+
 namespace nethack_qt_ {
 
 class NetHackQtInvUsageWindow;
@@ -54,7 +59,7 @@ public:
         void resizePaperDoll(bool); // ENHANCED_PAPERDOLL
 #ifdef DYNAMIC_STATUSLINES
         // called when 'statuslines' option has been changed
-        void redoStatus();
+        NetHackQtWindow *redoStatus();
 #endif
 
 public slots: