fixed propagation of VTK dependency

Config.cmake.in

@@ -3,7 +3,7 @@
 include(CMakeFindDependencyMacro)
 find_dependency(MPI)
 #todo(s.schulz): Somehow propagate the VTK switch...
-#find_dependency(VTK)
+find_dependency(VTK)
 
 include("${CMAKE_CURRENT_LIST_DIR}/ALLTargets.cmake")
 

src/CMakeLists.txt

@@ -48,8 +48,8 @@ if (CM_ALL_FORTRAN)
     set_property(TARGET ALL_fortran PROPERTY LINKER_LANGUAGE Fortran)
 
     if(CM_ALL_VTK_OUTPUT)
-        target_include_directories(ALL_fortran PRIVATE ${VTK_INCLUDE_DIRS})
-        target_link_libraries(ALL_fortran PRIVATE ${VTK_LIBRARIES})
+        target_include_directories(ALL_fortran PUBLIC ${VTK_INCLUDE_DIRS})
+        target_link_libraries(ALL_fortran PUBLIC ${VTK_LIBRARIES})
     endif(CM_ALL_VTK_OUTPUT)
 
     target_include_directories(ALL_fortran PUBLIC ${MPI_Fortran_INCLUDE_PATH})