Fortran: these lines should not be commented out

(cherry picked from commit 2cfdeff)

Author: jsquyres

ompi/mpi/fortran/mpif-h/profile/Makefile.am

@@ -435,12 +435,12 @@ CLEANFILES += psizeof_f.f90
 # Build the MPI_SIZEOF code in a separate convenience library (see
 # lengthy comment in ompi/mpi/fortran/mpif-h/Makefile.am for an
 # explanation why).
-#if BUILD_FORTRAN_SIZEOF
+if BUILD_FORTRAN_SIZEOF
 noinst_LTLIBRARIES += libmpi_mpifh_psizeof.la
 # Do not dist this file; it is generated
 nodist_libmpi_mpifh_psizeof_la_SOURCES = psizeof_f.f90
 libmpi_mpifh_pmpi_la_LIBADD += libmpi_mpifh_psizeof.la
-#endif
+endif
 
 sizeof_pl=$(top_srcdir)/ompi/mpi/fortran/base/gen-mpi-sizeof.pl