Implement deprecated wxPGProperty::GetValueString function only in wxPG 1.4 compatibility mode.

This function was marked as deprecated in 2008.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78391 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/property.h

@@ -1647,6 +1647,7 @@ public:
     */
     virtual wxString GetValueAsString( int argFlags = 0 ) const;
 
+#if wxPG_COMPATIBILITY_1_4
     /** Synonymous to GetValueAsString().
 
         @deprecated Use GetValueAsString() instead.
@@ -1654,6 +1655,7 @@ public:
         @see GetValueAsString()
     */
     wxDEPRECATED( wxString GetValueString( int argFlags = 0 ) const );
+#endif
 
     /**
         Returns wxPGCell of given column.