ENH: define righ include dir in HDF4 test

CMake/ImportGdal.cmake

@@ -183,7 +183,7 @@ IF(OTB_USE_EXTERNAL_GDAL)
   #${OTB_DATA_ROOT}/Input/MOD09Q1G_EVI.A2006233.h07v03.005.2008338190308.hdf  -> Test KO
   #${OTB_DATA_ROOT}/Input/GSSTF_NCEP.2b.2008.12.31.he5  -> Test OK
   IF(OTB_DATA_ROOT)
-    SET(CMAKE_REQUIRED_INCLUDES ${GEOTIFF_INCLUDE_DIRS})
+    SET(CMAKE_REQUIRED_INCLUDES ${GDAL_INCLUDE_DIR})
     SET(CMAKE_REQUIRED_LIBRARIES "${GDAL_LIBRARY}")
     CHECK_CXX_SOURCE_RUNS_ARGS(
             ${CMAKE_CURRENT_SOURCE_DIR}/CMake/TestHDF4Open.cxx