fortran: add the .o's back into libmpi_usempif08

Thanks to Paul Hargrove for the massive hint to find this.

This commit was SVN r32385.

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

@@ -730,6 +730,7 @@ libmpi_usempif08_la_SOURCES = \
 #
 
 libmpi_usempif08_la_LIBADD = \
+        $(module_sentinel_file) \
         $(OMPI_MPIEXT_USEMPIF08_LIBS) \
         $(top_builddir)/ompi/libmpi.la
 libmpi_usempif08_la_DEPENDENCIES = $(module_sentinel_file)