Fix weak vtables

src/blackmisc/simulation/interpolatorlinear.h

@@ -30,6 +30,8 @@ namespace BlackMisc
         //! Linear interpolator, calculation inbetween positions
         class BLACKMISC_EXPORT CInterpolatorLinear : public CInterpolator<CInterpolatorLinear>
         {
+            virtual void anchor();
+
         public:
             //! Constructor
             CInterpolatorLinear(const Aviation::CCallsign &callsign,