Make wxTextEntry::SetHint() work with all derived controls in wxOSX.

Previously, the method was only implemented in wxTextCtrl even though it used
wxTextEntry code to do the actual work. Move the implementation into
wxTextEntry.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75122 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/textentry.h

@@ -81,6 +81,10 @@ public:
 
     virtual bool SendMaxLenEvent();
 
+    // set the grayed out hint text
+    virtual bool SetHint(const wxString& hint);
+    virtual wxString GetHint() const;
+
     // Implementation
     // --------------
 
@@ -102,6 +106,8 @@ protected:
   // need to make this public because of the current implementation via callbacks
     unsigned long  m_maxLength;
 
+private:
+    wxString m_hintString;
 };
 
 #endif // _WX_OSX_TEXTENTRY_H_