Fix visibility of VTK's include directories in visualization tests

Author: SergioRAgostinho

test/visualization/CMakeLists.txt

@@ -8,6 +8,8 @@ set(build TRUE)
 PCL_SUBSYS_OPTION(build "${SUBSYS_NAME}" "${SUBSYS_DESC}" ${DEFAULT} "${REASON}")
 PCL_SUBSYS_DEPEND(build "${SUBSYS_NAME}" DEPS ${SUBSYS_DEPS} OPT_DEPS ${OPT_DEPS})
 
+include_directories(${VTK_INCLUDE_DIRS})
+
 if (build)
   if(BUILD_features AND NOT UNIX OR (UNIX AND DEFINED ENV{DISPLAY}))
     PCL_ADD_TEST(a_visualization_test test_visualization