Deprecate second parameter of wxSlider::SetTickFreq().

This parameter was never needed nor properly documented. Simply remove it from
SetTickFreq() and keep the overload still taking it for backwards
compatibility only.

Closes #12907.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66844 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/slider.h

@@ -59,7 +59,6 @@ public:
     int GetMax() const { return m_rangeMax; }
 
     // Win32-specific slider methods
-    void SetTickFreq(int n, int pos);
     int GetTickFreq() const { return m_tickFreq; }
     void SetPageSize(int pageSize);
     int GetPageSize() const;
@@ -131,6 +130,9 @@ protected:
     // of dragging the thumb or scrolling the mouse wheel
     bool m_isDragging;
 
+    // Platform-specific implementation of SetTickFreq
+    virtual void DoSetTickFreq(int freq);
+
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxSlider)
 };