Make SvxFillAttrBox available outside svx too

Change-Id: I44a4d59cdccaa3bc42e14ca95984f7334e269ea8

include/svx/itemwin.hxx

@@ -116,7 +116,7 @@ private:
 
 // class SvxFillAttrBox --------------------------------------------------
 
-class SvxFillAttrBox : public FillAttrLB
+class SVX_DLLPUBLIC SvxFillAttrBox : public FillAttrLB
 {
 public:
     SvxFillAttrBox( vcl::Window* pParent, WinBits nBits = WB_BORDER | WB_DROPDOWN | WB_AUTOHSCROLL );