remove useless USE_BOOST_POLYGON_LIBRARY cmake option, and remove unused files.

BOOST POLYGON is always used in zone filling functions.
Kbool is still in use in other calculations.

common/basicframe.cpp

@@ -532,12 +532,7 @@ void EDA_BASE_FRAME::CopyVersionInfoToClipboard( wxCommandEvent&  event )
     tmp << wxT( "OFF\n" );
 #endif
 
-    tmp << wxT( "         USE_BOOST_POLYGON_LIBRARY=" );
-#ifdef USE_BOOST_POLYGON_LIBRARY
-    tmp << wxT( "ON\n" );
-#else
-    tmp << wxT( "OFF\n" );
-#endif
+    tmp << wxT( "         USE_BOOST_POLYGON_LIBRARY" );
 
     wxTheClipboard->SetData( new wxTextDataObject( tmp ) );
     wxTheClipboard->Close();