fortran/use-mpi-f08: do not slurp the sentinel module files

A sentinel is only an internal Fortran module and hence should not
be slurped into libmpi_usempif08.so

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>

ompi/mpi/fortran/use-mpi-f08/Makefile.am

@@ -7,8 +7,8 @@
 # Copyright (c) 2012-2013 Inria.  All rights reserved.
 # Copyright (c) 2013-2018 Los Alamos National Security, LLC. All rights
 #                         reserved.
-# Copyright (c) 2015-2018 Research Organization for Information Science
-#                         and Technology (RIST). All rights reserved.
+# Copyright (c) 2015-2019 Research Organization for Information Science
+#                         and Technology (RIST).  All rights reserved.
 # Copyright (c) 2016      IBM Corporation.  All rights reserved.
 # Copyright (c) 2017-2018 FUJITSU LIMITED.  All rights reserved.
 # Copyright (c) 2019      Triad National Security, LLC. All rights
@@ -822,7 +822,6 @@ endif
 #
 
 lib@OMPI_LIBMPI_NAME@_usempif08_la_LIBADD = \
-        $(module_sentinel_file) \
         $(OMPI_MPIEXT_USEMPIF08_LIBS) \
         $(top_builddir)/ompi/mpi/fortran/mpif-h/lib@OMPI_LIBMPI_NAME@_mpifh.la \
         $(top_builddir)/ompi/lib@OMPI_LIBMPI_NAME@.la