SuperBuild: ossim pass correct cmake variable for freetype include

SuperBuild/CMake/External_ossim.cmake

@@ -35,9 +35,10 @@ else()
   ADD_SUPERBUILD_CMAKE_VAR(JPEG_LIBRARY)
   ADD_SUPERBUILD_CMAKE_VAR(OPENTHREADS_INCLUDE_DIR)
   ADD_SUPERBUILD_CMAKE_VAR(OPENTHREADS_LIBRARY)
-  ADD_SUPERBUILD_CMAKE_VAR(FREETYPE_INCLUDE_DIR)
   ADD_SUPERBUILD_CMAKE_VAR(FREETYPE_LIBRARY)
 
+  list(APPEND OSSIM_SB_CONFIG "FREETYPE_INCLUDE:PATH=${FREETYPE_INCLUDE_DIR}")
+
   set(OSSIM_CXX_FLAGS  -D__STDC_CONSTANT_MACROS)
 
   if(MSVC)