restore removed function

It is used by the tubes collaboration stuff.

Change-Id: I9e31f0588f6c400716fba29806c1dab462c32a43

sc/source/ui/inc/docsh.hxx

@@ -227,6 +227,7 @@ public:
 
     ScDocument&     GetDocument()   { return aDocument; }
     ScDocFunc&      GetDocFunc()    { return *pDocFunc; }
+    void            SetDocFunc( ScDocFunc *pDF ) { pDocFunc = pDF; }
 
     SfxPrinter*     GetPrinter( bool bCreateIfNotExist = true );
     sal_uInt16      SetPrinter( SfxPrinter* pNewPrinter, SfxPrinterChangeFlags nDiffFlags = SFX_PRINTER_ALL );