[FIX #363] we do not need OSSIM to compile GFA module

src/modules/modules-others.toolbox

 ADD_SUBDIRECTORY( applyMask )
 ADD_SUBDIRECTORY( arbitraryPlane )
 ADD_SUBDIRECTORY( atlasSurfaces )
+ADD_SUBDIRECTORY( calculateGFA )
 ADD_SUBDIRECTORY( clusterDisplay )
 ADD_SUBDIRECTORY( clusterParamDisplay )
 ADD_SUBDIRECTORY( clusterSlicer )
@@ -20,10 +21,6 @@ ADD_SUBDIRECTORY( scalarSegmentation )
 ADD_SUBDIRECTORY( splineSurface )
 ADD_SUBDIRECTORY( surfaceParameterAnimator )
 
-IF( OSSIM_FOUND )
-  ADD_SUBDIRECTORY( calculateGFA )
-ENDIF()
-
 IF( Teem_FOUND )
   IF( OSSIM_FOUND )
 	ADD_SUBDIRECTORY( bermanTracking )