Refactor itrform2.[ch]xx a bit for better insulation.

sw/source/core/text/itrform2.hxx

@@ -29,8 +29,6 @@
 #define _ITRFORM2_HXX
 #include "itrpaint.hxx"
 
-#include <vector>
-
 class SwFlyCntPortion;
 class SwInterHyphInfo;
 class SwDropPortion;
@@ -102,9 +100,6 @@ class SwTxtFormatter : public SwTxtPainter
     // determines, if a optimized repaint rectange is allowed
     sal_Bool AllowRepaintOpt() const;
 
-    // calculates and sets the optimized repaint offset
-    long CalcOptRepaint( xub_StrLen nOldLineEnd, const std::vector<long> &rFlyStarts );
-
     // wird von FormatLine gerufen.
     void FormatReset( SwTxtFormatInfo &rInf );