MWGIS-235; add ReSourceLayer method back into the IDL file.

Author: jerryfaust

src/MapWinGIS.idl

@@ -6918,6 +6918,7 @@ library MapWinGIS
 
             [id(48)] IDispatch* GetColorScheme(long LayerHandle);
 			[id(92)] VARIANT_BOOL SetImageLayerColorScheme(LONG LayerHandle, IDispatch* ColorScheme);
+			[id(143)] void ReSourceLayer(long LayerHandle, BSTR newSrcPath);
 
             [id(263)] VARIANT_BOOL ReloadOgrLayerFromSource(long OgrLayerHandle);
 			[id(264)] void RestartBackgroundLoading(long OgrLayerHandle);