Allow to be included is ctest -S driver script (trilinos#2462)

I just added an if statement to guard calling INCLUDE_DIRECTORIES() to allow
including in a ctest -S script.  This makes it so that the same enable/disable
options are seen in the outer ctest -S driver enable/disable logic as the
inner CMake configure.

cmake/std/sems/SEMSDevEnv.cmake

@@ -29,12 +29,14 @@ IF (TPL_ENABLE_MPI)
   ASSERT_DEFINED(ENV{SEMS_OPENMPI_ROOT})
   SET(MPI_BASE_DIR "$ENV{SEMS_OPENMPI_ROOT}" CACHE PATH
     "Set in SEMSDevEnv.cmake")
-  # Make OpenMPI 1.6.5 mpi.h with GCC 4.8.3 warnings go away (see #1341)
-  INCLUDE_DIRECTORIES(SYSTEM "$ENV{SEMS_OPENMPI_ROOT}/include")
-  # NOTE: With TriBITS, all soruce files get built with the MPI compiler
-  # wrappers so it should be safe to add this include directory with -isystem
-  # to all builds.  The only worry is Fortran 90+ code that will cause
-  # problems with older versions of gfortran.
+  IF (COMMAND INCLUDE_DIRECTORIES)
+    # Make OpenMPI 1.6.5 mpi.h with GCC 4.8.3 warnings go away (see #1341)
+    INCLUDE_DIRECTORIES(SYSTEM "$ENV{SEMS_OPENMPI_ROOT}/include")
+    # NOTE: With TriBITS, all soruce files get built with the MPI compiler
+    # wrappers so it should be safe to add this include directory with -isystem
+    # to all builds.  The only worry is Fortran 90+ code that will cause
+    # problems with older versions of gfortran.
+  ENDIF()
 ELSE()
   # Set up serial non-MPI compiler wrappers
   ASSERT_DEFINED(ENV{CC})